I recently went into my Hewland Mk8/9 gearbox and had a rough time getting the cotter pin out of the layshaft. When I went to put it all back together, I saw that the drawbolt goes too far in to allow access to the cotter pin hole. It would have to be backed out about five or six full turns to get a cotter pin through it. It also won't go in quite far enough to put the cotter pin behind the head of the drawbolt like the former owner tried to do. Any thoughts?