Yep, do you know anyone who has a grinder with 3" TPF arbor?
At the moment I think I'm just going to chuck them in the botttom drawer and look at them every so often to remind me than LH ADPTR 200-1 is not the same as CIN LH ADPTR C200-1... :no:
I suspect 3" TPF might be more common than the Cincinnati 4.5" TPF taper.. dunno?
Regards
Ray