Originally Posted by soc123_au
Someone has taken to your headbutton with a dremel. If you just go with the part # in the manual you will be fine. The mod to your head button is a waste of time anyway. All it does is drop compression, you are better off with an extra shim & at least the extra shim wont stuff up your squish band.
........Well, the 'dremel effect' was done by someone at RB, because I purchased the engine new.