The 5" screws are zinc plated. There are products specifically made for blackening zinc plated steel. It is not commonly stocked as near as I can tell. Instead of oxidizing the zinc, it molybdates it. This is curious because zinc molybdate is white not black.
I used one of the DIY black finishes a few years ago for an American Arms PK-22, a licensed copy of the PPK which uses a zinc frame and receiver. It came out okay, but I wonder if this product might have been a better choice.
The combination of thumb nut and 5" screw should work.
It is a tight enough fit at the head that I doubt it will move on the screw either direction. I may put a lock washer between head and thumb nut and a lock washer and nut on the other side as well to get it very screw. Another extreme solution is the drill a hole in the other end and use a set screw to lock it very solidly to the screw.
I thought that I ordered 5/8" diameter thumb nuts but these are 1", a bit too big. No, I ordered 1". I was clearly no thinking so I ordered some with 5/8" diameter.
The more I think about it, once I get the right thumb nuts the more I think I will do some small set screws to hold these in place. Setting them up in the mill to drill the holes and tap is easy.
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