Replacement for Girling Brake Drums

[squeak]

I recently made a pair of cast iron drums for another car.  A spacer ring was made to reduce the center register hole and welded in. The PCD  had to be changed and so I welded up the old holes.  I found it impossible to redrill the holes even with a cobalt drill and had to resort to a different sample drum. leave the old stud holes and drill fresh ones