LOL What he said. I had to replace the crankcase on my GK 100 after a beautiful loop into the ground cracked it. I had a heck of a time getting the collet off, the rest was pretty easy after that, used a paint stripping heat gun instead of a torch. Of course, I kept the bearings in it since I bought new ones with the new case, but I can't find the old case, and have another 100 that needs bearings, they howl louder than the engine when running. I bought some Boca bearings for it instead, just haven't gotten around to pulling it off the Cub yet.