He has one broke off though I believe. If you don't feel up too the task of taking it out take too a local machine shop. Unless Cactus will do it as warranty work you ll save a good bit. IF you try it yourself, try taking a small chisel an carefully tap the bolt counter clock wise too remove it. Or use a mig welder to spot weld a small nut unto the bolt. You don't have to worry bout the weld sticking to the aluminum head. Few other things you can do but those are probably the easiest.

Dan