-=- originally posted by rix85XJphx
What's "the inside lip"?
I consider the 'lip' of a drum to be the round flanged edge that circumscribes the backing plate. Do you mean the inner flat surface?
Could be that one of the retainer springs on a shoe has loosened or broken, allowing the shoe to kinda pivot out of position and contact the drum.
I would expect to see wear on the shoe edge, but maybe it's camoflaged with brake dust?
Please DON'T, unless you are going to use hard-to-get grade 5 steel washers, sized perfectly to the stud. Didn't use them when I realized that the end of the stub is slightly larger in diameter than the threaded stud - to support the drum. If I put the washer on, the drum would be supported by the threaded stud
Standard washers are so soft that you risk damage/injury using them this way.