RE: An oddd request
ok.. please check it.
If the button is rotating, the head clamp/head bolts are not tight. The head clamp (fins) hold the liner and head button in place.
If it is rotating, there is a 98% chance you rotated the entire liner assembly.
Remove all of the head bolts ... and remove the head clamp.
You will definately have to inspect and re-align the liner, and then reinstall the head clamp.
After you reassemble, run the engine with a regular (light) prop for a tank. Sorta re-break-in.
And, after shut down, with the engine still a bit warm, check the head bolts.
Bob