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Thread: Sac too long?

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    Senior Member Yazeh's Avatar
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    Default Sac too long?

    This was my first attempt at changing a sac. I got to excited and didn't cut the sac short.
    The pen is a Unic (scroll down to Unic) a French pen, fine nib, slightly scratchy and wet noodle.

    Is it worth re-sacing or shall I wait under the sac bites the dust (or ink)....

    20210302_212947.jpg

    20210302_213142.jpg
    Last edited by Yazeh; March 2nd, 2021 at 08:11 PM.

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    Default Re: Sac too long?

    Why not take the sac off, trim it to the correct length and put it back on.

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    Senior Member Jon Szanto's Avatar
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    Default Re: Sac too long?

    As Farmboy said, you can just take the sack off (either by actually removing from section, or just cutting there and scraping off what is shellaced to the nipple) and then re-do it. Measure carefully and then cut shorter than the total length. It is best to not have the sac rubbing against any part of the barrel. I can't tell if you put talc on, but that is something that should happen as well. Full details on Binder's resac-ing page here.
    "When Men differ in Opinion, both Sides ought equally to have the Advantage of being heard by the Publick;
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    FPG Donor ♕ Chrissy's Avatar
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    Default Re: Sac too long?

    Quote Originally Posted by Yazeh View Post
    This was my first attempt at changing a sac. I got to excited and didn't cut the sac short.

    Is it worth re-sacing or shall I wait under the sac bites the dust (or ink)....
    As has already been said you should remove the sac and refit it. It's a no brainer as you're only going to possibly damage the piece you will cut off.
    Regards, Chrissy | My Blog: inkyfountainpens

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    Default Re: Sac too long?

    Pretty pen!

    Looks like this was done a while ago, as the sac has taken a liking to its "accordionized" shape. For the couple of bucks, a new sac may be a decent choice.

    If the sac is still supple, it should peel/roll back off of the nipple pretty easily. If you have inked the pen, make sure to rinse out and dry the sac.

    Bob

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    Default Re: Sac too long?

    Others have given you the most sensible thing to do.

    I'll just add that an easy way to cut the sac at the right length is to line up the sac, the section, and the barrel -- do this on a non slippery surface, where you can set the parts and they will stay put, instead of rolling around.

    Line them up in such a way that the relative position reflect how they are going to be once assembled.

    If you do it this way, you'd be able to gauge pretty accurately where the cut should be.

    (That's three labored sentences attempting to describe what it would take me 10 seconds to demonstrate) ... I miss pen shows.
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    Senior Member Yazeh's Avatar
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    Default Re: Sac too long?

    Thank you so much all. Will do as instructed. How much distance between the end of the sac and the barrel?
    I guess if I cut it and scrape it, the size will be good enough.

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    Senior Member FredRydr's Avatar
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    Default Re: Sac too long?

    Quote Originally Posted by penwash View Post
    ...Line them up in such a way that the relative position reflect how they are going to be once assembled....
    And keep that last bit in mind! If in doubt, cut on the shorter side of the line.

    Isn't this fun?

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    Default Re: Sac too long?

    In replacing the barrel others may suggest that you align the lever to the nib, however it is more important to make sure that the lever and clip do not line up so that there is no risk of the lever catching when putting the pen in your pocket.
    Last edited by Fermata; March 3rd, 2021 at 11:35 AM.

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    Senior Member Yazeh's Avatar
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    Default Re: Sac too long?

    The pen has no clip...that's what I like about it...

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    Default Re: Sac too long?

    Quote Originally Posted by Yazeh View Post
    Thank you so much all. Will do as instructed. How much distance between the end of the sac and the barrel?
    I guess if I cut it and scrape it, the size will be good enough.
    Slide the sac into the pen until it just rests on the bottom of the first thing it hits then line up the section as if it were in the barrel and hold the end of the sac and slide the whole mess out. Cut the sac 1/32" shorter than the bottom of the nipple where the sac would normally rest.

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    Default Re: Sac too long?

    Well, if one wants to get into the small details... With the new sac in the barrel, I cut flush with a single edge razor, or clamp flush with forceps, first. It is then easy to align sac with nipple for a quite accurate final cut. This also keeps the razor away from fingers, as you don't have to juggle a pinched sac against a rolling section. Since there are differing mechanisms inside of lever filled pens (not all are curved J-bars), cutting that additional 1/32 is a good measure.

    Bob

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    Default Re: Sac too long?

    1mm would do it, too. ;-)

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    Default Re: Sac too long?

    So 1/25.4... of an inch for those who still use a yard stick. More than a hair and a bit less than a smidge. The point being not too long!

    Bob

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    Default Re: Sac too long?

    Removed the sac. So easy and fun. It just peeled off.

    20210305_141755.jpg

    I'm tempted to cut it here:

    20210305_142623.jpg

    Here is with the feed:

    20210305_142648.jpg

    Does that look correct?

    Thanks again to all for your feedback.

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    Default Re: Sac too long?

    It looks just a tad short to me. It looks like the barrel is too high, bring it more in line with the section as if it were installed and that should give you the right place to cut the sac.
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    Senior Member Yazeh's Avatar
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    Default Re: Sac too long?

    Quote Originally Posted by KrazyIvan View Post
    It looks just a tad short to me. It looks like the barrel is too high, bring it more in line with the section as if it were installed and that should give you the right place to cut the sac.
    Thanks. You're right... I'll correct it...

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    Senior Member Jon Szanto's Avatar
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    Default Re: Sac too long?

    Whoa whoa whoa! This is a pretty simple measurement but needs to be done carefully. You calculate in the following way:

    1. First, look at the section, as there are three parts: the part you grip, the part that slides inside the barrel, and the final part, a little narrower, which the sac is placed on. Measure the length of the middle part.
    2. Second, you need to measure the barrel from inside, to take into account the thickness at the bottom of the barrel and any part of the pressure bar. Some pens may not be bored out all the way to the end, and if you measure from the outside you'll get a false length. Slide a very thin stick or similar (I happen to use a bamboo skewer) inside the barrel until it touches the end, and then make a pencil mark exactly where it comes out the open end of the barrel. Take a measurement from the tip of the stick to the mark you made.
    3. To determine the length of the sac, add together the 1st measurement and the amount of space you want at the end of the sac/barrel (I believe 1/32" was mentioned earlier).
    4. Subtract that total from your 2nd measurement (the barrel inner length) and that will tell you the total length of the sac for this pen. Trim enough off the open end to have a sac of that length.

    I hope that is clear. It would be a waste if you cut the sac too short, though the only true downside would be less ink supply.
    "When Men differ in Opinion, both Sides ought equally to have the Advantage of being heard by the Publick;
    and that when Truth and Error have fair Play, the former is always an overmatch for the latter."

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    Senior Member Yazeh's Avatar
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    Default Re: Sac too long?

    Thank you Jon. Helped a lot.... Will do it tomorrow morning...and keep you posted...

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    Senior Member FredRydr's Avatar
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    Default Re: Sac too long?

    Quote Originally Posted by Yazeh View Post
    ...Does that look correct?...
    No.

    As penwash stated and I reiterated above, the section should be placed in relation to the barrel as shown in this edited photo where I shifted the section, like so:

    20210305_142648.jpeg

    Finally, the sac is measured by placing next to these such that when cut to length, it will not touch the inside end of the barrel. For the final cut, it is better to err slightly short than long, but like a good carpenter: Measure twice; cut once.
    Last edited by FredRydr; March 5th, 2021 at 09:42 PM.

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