I was thinking about this the other night, but couldn't pen sacs be made from TPE also? Like silicone, feels a lot like it and it's used in medical implants and can be moulded.
Just wondering, do they come small enough to fit a Peter Pan pen? In the next few weeks I need to get a sac for one and I'm going to replace the sacs in all my Duofolds, and Doric which have the old silicone (vinyl sacs).
Actually I'm just having issues with getting the section to budge. Does it have regular threads or backwards threads. It is not one of the transparent sections.
Then, what's the best way to go about removing the filler from the pen. I see it is kind of fitted like a Vacumatic filler unit.
I'm sure someone here knows off the top of their head what size sacs I need for a Wahl Oxford twist filler and a dinky Peter Pan. I can't find any information on either of these as most lists only name the most popular pens by the large manufactures.