Welcome to Bikeforums! Please do note that there is a "Bicycle Mechanics" forum right here on Bikeforums; if you have not already seen it, you may want to ask there. It is quite possible that the people best able to answer that question may concentrate on that part if Bikeforums. Some forums don't like multiple posts on the same subject posted in more than one place, but around here, it is OK, especially for new members. Good luck on your problem-solving!