owlelope
Member
I have purchased some 306 cartridges to make some cartridge pens. I am planning on using 7mm tubes to make slimlines or European pens. When I take the 7mm tube and put it in the cartridge it fits too loose. In reading several tutorials one of them said to solder the tube in. I am not much on soldering so is there a different way to get rid of the sloppy fit? In measuring the casing it appears that it is 8mm so i guess I could get the 8 mm european style pens but I would prefer to use what I have.