New brakes binding

[Zetomagneto]

I've just fitted relined front brake shoes, with new endaps. New brake shoe springs, cams and bushes. The brake drums are new cast ones. Top pivots were secure.

When shimming the top pivot, I followed the advice in Woodrow, to pack them until the shoes were "just touching the drum", before replacing the hub.

With the hub back on (with new bearings) and the drum screwed down tightly, about 2/3 of a turn is free, but the remaining third is way too tight.

As I said, they are new cast drums so will be perfectly round, so can anybody explain a) what is happening, and b) how I rectify it?

Thanks
John

Have you tried it with the wheel back on and all 3 nuts tight, sounds as though the drum may not be square to the shoes