Hi Karl, Best to find R/H thread drums, at least for the 60 thru 64 version that have the drum held on to the hub by the peened-over studs. On later versions that have the drum coming off from the hub, it's easy just to change studs. Trying to remove the peened - over studs without proper ( and unavailable ) tools will result in damage to the hub. First, one should have the proper tool to remove ( cut) the peened-over area. Then , one should have the proper tool to re-peen the new studs. Yeah, right... John