Hank, I wasn't referring to the slot/woodruff key. I have a '38 Plymouth Coupe.....the drums have a locating pin (4 rivets & 1 locating pin-which doubles as a rivet that holds the drum to the hub), which makes installing the wheel easier while threading the lug bolts in the hub. Not sure if the trucks have the same locating pin on the hub/drum assembly. My post was in response to Jeff's post about a mod to make the rear drums removable without the use of a puller. Also, from what i understand, you are not suppose to use ANY kind of lube or anti-sieze on a tapered axle when re-installing your drums.....if that's what you were getting at.