D-will-, you'd do well to read this whole thread, maybe twice, and pay a lot of attention to 1911Tuner's advice. Also look in the smithing/maintanance area, and you'll find a thread about this very subject, with some excellent pics of what you should be seeing. There's also a test regimen to follow when you're ready to see if your fix worked.
The thumb safety operates by blocking the movement of the sear, locking the sear against the hammer. It has NOTHING to do with the trigger; that's the grip safety's job.
I can't stress this enough: BE VERY CAREFUL WHEN YOU REMOVE METAL. The reason I had to fit a safety in the first place was that I installed a new hammer and safety set, and the thumb safety wouldn't seat properly because the stud on the thumb safety was being blocked by the new sear (which didn't have exactly the same profile as the stock sear.) I filed too much, AND in the wrong area, and ended up having to "upgrade" to a $39 King's extended thumb safety. I think I actually like the old GI part better.
If i could do this, you probably can, too. Good luck, don't get too file happy, and be patient.
"Evil is powerless if the good are unafraid."- Ronald Wilson Reagan
"Mmmmm.....tasty burglar......"- Tonka the Large Dog
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