Something I might try myself some day in your situation, is to alumi-braze
that piece back on, but don’t use that clamping bolt anymore
to tighten the mag plate.
Instead, one could drill and tap a hole in the “unbroken” portion of the ring,
and use some kind of friction plug, i.e., a nylon bolt.
Anyone think that would work?
Prepare to be boarded!
