
Looking for an obsolete Sargent key blank. This lock has a master key, cut on Ilco blank 1007MR, but I need blanks to cut a change key. Presumably 1007MR corresponds to original Sargent MR keyway. Both are long-obsolete. Anyone know of a source for these blanks, or an acceptable substitute?
Closest I could find was Corbin BR keyway blanks, but these couldn't quite be altered to fit.