Actually,that is exactly how RK shells with the wide re-rings were done.One on and one off the re-ring...The holes with the washer imprints are the original holes.You will sometimes find washers with a small part of the edge removed to fit past the inside edge of the re-ring.
Kev.
I didn`t know that, never had these drums before. Drill stations do they same thing all the time and freehand will have differences.
Creighton, use a framing square and line up the cast lug holes on center and compare the small holes to that line. if the small holes were hand drilled useing a hand made jig, there will be minute differences. Then do the same with the small holes to see if the larger holes are out of tolerences.
You should be able to detect one set of holes different than the other in tolerence. If they all line up and appear within tolerence, then the factory did this !i