Thanks Derek, the mail lady laughed when she handed the package to me, she said, "all the way from Australia huh, see we're good aren't we", who could argue with that. The brass insert is in place under the tension screw. My Irvine .40D has the reducer in the muffler that you mentioned, I don't think it is needed on the .20. If so I can whip one up in nothing flat. Let me know what JE says about the liner and piston. Thanks again, I'll enjoy it. I have a 20 sized TeleMaster somewhere that begs for that engine.