Burns, butcherbill, I think I owe you both a beer. I fashioned a shim from aluminum foil. Seems to be holding very tight. Will get it out to the range shortly.
Maybe I will blacken the shim with a sharpie.
Somewhere in Germany a gunmaker is rolling in his grave.
I recently needed to do some light Bubba dremel work (Bubba+Dremel= Match made in gun hell) on a set of weaver bases to lower the center of the bases so I could see the rear sight when the quick detach rings were off. Naturally, the bright, recently ground Aluminum needed to be fixed. Tried a sharpie but found that smoking the bases with a lighter worked much better. Not a permanent fix but more durable and blacker than the sharpie.