Vincent,it yust fits using the bearing of the wheel, note the lack of Rubber arround the drumView attachment 16317
What speed is the lathe turning? I did a drum yesterday and was getting too much chatter.
What type of insert are you using?
When I set the rear hub up on the lathe between centres, the runout on the drum was in excess of .012” which maybe doesn’t sound like a lot, but it looked horrible… like I would need a bigger damper on the RFM and stabilizers for my eyeballs.
I ended up using a small tool post grinder instead of a boring bar. The axle, bearings, hub, and drum were all new, so it seems a little surprising. The shoulders on the hub (where the spoke flange and drum sit) were different sizes end to end. Different tolerances everywhere.