Greg compression is adjusted via the head not raising the cylinder off the block ( sorry poor joke)
Really hope all is well after cylinder "tied down tight" martin

Had an issue with my little playboy PAW 06 was checking plane on bench and noticed a little vibration turns out the engine bolts 2/56 on one side of mount the missing the nuts
engine is new very little time did 12K on a black 7x3 prop is a little light PAW states 7 x4 on break in will have to pick one up