By cutting sections out of the brass fixture that holds the front and back in place, shims can be made to locate the bonnet and keep it from sliding forward. First You must buy the brass fixture. I can not find it in the Morgan Spares catalog. Call Linda Eckler I am sure She has them in stock. If not Mel Rutter will have them. Cut them cross wise like a loaf of bread. Check with Derek Wilburn or His brother John. Also Bill Fink or Mike Anthony will know about this. You live in Santa Monica, so Derek Wilburn is your best bet. Dennis Glavis can put you in touch with Derek. Denis owns "Morgan West".