I decided to check the runout on the drum since I had the gizmo I made to do just that. It wasn't as bad as the quick check I did the other day. The indicator said .007".
Instead of making an arbor of any kind, I chucked the drum up in the 4 jaw on the lathe. The outside of the drum was machined at the factory because the sprocket is riveted on. I indicated the outside of the drum and then started machining the inside braking surface. After the initial pass, it didn't look quite right so I measured the wall thickness of the drum and the inside and the outside measurements looked good. However, after I got done I put it the wheel back together and checked it with the indicator again. Unfortunately, it has a nice finish but it runs out some. I'm going to put it all back together on the bike and adjust the brake pedal to see if it pulses when applying the brake. If it's not acceptable, I'll make an arbor and skin cut the surface again. I know HD had some quality issues back in the day. This might be one of those.
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