Screw size

A home owner from Michigan says:
I have ordered an extension handle and a crank handle. Since there is no set screw on the handle extension I would need to have a screw roughly 5 1/8 long to secure both. What is the screw diameter?
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Paul from SWISCO responded:
I see you purchased our 39-121 and 39-537. We have actually never come across a situation were these parts would be used together. You can try a local hardware store, they may have what you need. I suppose you would require an 8-32 round head screw that is 5-1/8" long
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