I just picked up a Mk1 later style pistol. It needs new seals. The piercing cap fell apart when I took it out of the gun. The star washer, and then a thicker steel washer with a slot on one side like a screwdriver slot. I don't know if it goes up or down. It is part number 10-082 in this schematic. for the Mk1 (MkII) Service Manual II
I'm sure I need to put new seals through out this gun. I guess I will be ordering several kits from Tim at Mac1. The other question is how does that above part, the thicker steel washer with a slot in one side, go in? Does it go with the slot facing down towards bottom of cap or up, as in facing the Co2 canister and facing up as in towards top of gun?