W
I have two psi engines with Dial-A-Dome heads, I understand how they come apart but in trying to disassemble them I find that about a quarter of a turn is all I can turn the chambers. I tried PB blaster and a moderate amount of force in the correct rotation, they seem to all go about the same distance and lock up pretty tight. I usually ride the one at the same elevation and have never tried to increase or decrease the compression. The other one I've never fired, bought it used and am just rebuilding it. Any tips would be appreciated.