Quote Originally Posted by evert View Post
Some Supersports/Lightnings I have worked on have had alignment problems with the holes in the rear block and the holes in the cylinder.
The alignment issue is most likely caused by the opposing cap head screw which fastens through the Maxigrip rail, it makes the back block camber over when the rear guard screw is removed, sometimes chewing the thread too. A good tip to avoid this is remove both screws and reinstall simultaneously.

Cheers
Greg