Got it! The hole in the throttle lock is the shank hole and the hole in the housing is the pilot hole. For some reason I thought there were two holes in the throttle lock. D'oh! Last question: Self-tapping screw?In typical wood-working parlance, this would be called the shank hole and the pilot hole would be in the housing.
Thanks! I've always liked those grips but didn't bother because of the metal caps and bar-end weights. I might swap them for my BMW grips.I used a 7/8" hole saw to remove the centers of the grip ends.