Nick Hull wrote:

I'd like to get a hold of one 4-48 screw to test to see if it
fits into the business (test contact) end of a Federal test
indicator I have. If it fits I will need one or 2 screws at
least 1/2" long, any head or no head, but just to test any 4-48
thread should do.

You can get a box of them from McMaster-Carr for 10 bucks + shipping.

Wes