Wendellc1, I have had this happen before and it can be a major pain in the arse. Pull the sleeve out if you can (with head button attached and heat the sleeve with a heat gun. You may even want to lay an ice cube on the head button just before you try and pull them apart. The idea is to heat the brass up and keep the aluminum cool so the brass will expand away from the aluminum head button. Try not to pry on it as this can lead to damage. By all means DO NOT hydro lock the engine with fuel and force the button off, as that will almost surely bend or damage your connecting rod! Heat, Heat, Heat!

Rody, The best pipes I have tested so far for the .12 size racing mills have been the Mugen X12 one piece pipe and the RD Logics Turbo 2 one piece pipe. I think you will find they are both great. Myself, I would choose the Mugen pipe.

BK