Thanks to all for their input. I believe the shimming idea is a sound solution especially in situations where the screw is indexed somewhere between the 9 and 12 o'clock positions. However, I think steel shim stock, cut into washers, would be the best material to use since it can be aquired in various thicknesses and, being a similar metal, would not likely promote corrosion.
As I wrote in my original post, in my situation the screw is just short (approximately 30 degrees) of being correctly indexed. Adding enough shimming material under the screw head to bring it to the 9 o'clock position would, if my math is correct and assuming the screw has approximately 32 TPI, require about .026 of shim material. That just seems to me to be too much shimming.
Another option ... If approximately .005" of material was removed from the underside of the screw head the same results would likely be achieved. I fully realize that removing any metal on a gun had better be well thought out in advance, but this solution seems so simple and innocuous.
I'm looking forward to your thoughts.
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