I might add that when you read the back of the package of the new rotor head carefully. Up to and including the loctite. You MAY need to get some 400 grit sandpaper and smooth down the old screw bites so you can slide the new parts down the shaft. You can mark a little circle around the top of the shaft with a Sharpie indicating the top of the old collar and a verticle hash mark to indicate where the old screw holes are. Good luck!

Rikyob