Originally Posted by
Jeph
That is how old corks works.
The cap closure just screws off of the car barrel and the clip is sandwiched between the two. A little more soaking and a little heat should let you screw the closure off.
The nib is steel, but many of the old steel nibs are very good which includes Osmia.
It is an Osmia 61 with a fine left oblique (the common oblique) nib. What looks like a bend is actually how it was made. To use it, you rotate the pen slightly counterclockwise until both tines rest evenly on the paper. This will give you line variation without pressure: the down and right lines will be thicker, the up and right lines will be narrower, and both the vertical and horizontal lines will be somewhere in between.
I always grip those piston housing threads with a leather (rubber also works) strap to get a grip without damaging the threads.
If the piece of rubber tube works to seal the piston that is good. Just make sure that you do not have too much of an interference fit or you risk splitting the barrel.
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