Tom, I'll consider that. When I reassembled the mainspring assembly, I took care to take advantage of the squiggle that is in the spring, positioning it so that it swoops away from the grip safety spring. Night before last, I shot those 4 mags (one MecGar, one fxo, each filled twice) with no issues and finished with an extra 6 rapid fire, again no problem. So far, so good. I'm gratified at this, at least. 30% brass loss in the grass; I'd better do something about that. Anyway, I'll take the grips off soon and see if the spring's orientation has changed after shooting this number of rounds. If it remained where I put it, that will be good, and I will forgo any grinding for now.
A technique I've used to see if things are, indeed, scrubbing is to coat one of the suspect parts with magic marker and see what is disturbed after operating a bit. Excess comes off with alcohol when you're done.
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