Can anyone tell me the ID of the area of the front clutch drum that the sealing rings run? I have kinda gotten into a mess of a problem. Nephew who teaches machine shop volunteered to install a bronze bushing into my old aluminum drum since the sealing rings have worn grooves into it over the years. One of his students bored the drum out and quit the class the next day. Nephew doesn't know what the ID of the bushing should be, and I don't have an old stock drum to check, anybody have an old one to measure?