First post, and wasn't sure wether to post here or in REPAIR ? Moderators can move if appropriate.

I have, what I assume is a late 1940's vacumatic in "dove grey" Gold filled cap, blue diamond, "pearl" end jewel, with a fine nib. Great writer and still fills okay, But......

The filler plunger, which is clear plastic, doesn't make full strokes even when I'm very careful. The plunger makes a "hard stop" about halfway down. [like it is running into something hard]
Very occasionally it will make a full stroke.

It still fills and lasts about as long as my other pens [eight or ten half strokes]. I'm not interested in having it repaired/restored as long as it still fills and writes well, but am curious if this is at all normal or what the problem/fix might be?

On a side note I did purchase a new Deluxe 51 with a fine point and am impressed for daily writing. I'd have to have some sort of scientific apparatus to really determine which is the the smoother writer Old or New.

Thanks
Mike