Originally Posted by
pelletcaster
A TbT kit should be a proper investment.
I'd go for the maxi-kit as this includes an original spring with properly fitting guides. Talk to the owner/seller to have the spring shortened to the a/m power range. Or shorten yourself.
Piston seal is also available there.
Keeping a leather piston seal piston and switching to a todays seal needs an adapter availabe as far as I know from Chambers or Knibbs.
Disassembly, proper clean and degrease, debur and polish and a final regrease with TbT's grease included in the kit shouldn't take too long and would most certainly result in a very nice shooting gun.
Top cream would be a trigger tune (sears polish and proper regrease).
Hope this helps.
Happy shooting.
Andy from Austria