Help please rebuilding SP R109 (metal)

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R

redacted

Guest
I added a few really bad shape Scubapro metals to my collection and the worst one required some pretty rough treatment of the socket head screws to remove the clamps. No problem (I thought) as I had an number of replacement screws that come in the R109/M50/G200 kits these days. But the new socket head screws are an obviously finer thread and look to be just a little thicker. Old screws were 4-40 so I might be able to find a suitable substitute at a hardware store. But I think I would rather retap the thread in the clamp. Anyone know the size for the tap I will need. Or am I just going to have to make the salesman at Sears really work for this sale. I'm hoping there is a Scubapro TB addressing this somewhere but LDS does not have it.

Thanks
 
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