"I believe the left bushing has rotated out, and the hole may have been peened at some time previously to prevent it."
Correct Drew. I just happened to have the tip to remove the bushings, but the blades on the tip needed to be thinned to properly fit the grooves. The bushings have to be "timed" to be flush all the way around the edges. The threads in the receiver run deep, so it's possible to over recess them. My remedy to keep the bushings flush and secure was some blue Loctite. The bushings are smooth with the receiver face now and if the Loctite holds they won't require any more attention. It kept me busy this morning and luckily worked out well.
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Threaded Mode