In doing a chamber cast on my drilling I remover the extractor and in the reassembly I dropped the retaining screw. I assume the little bugger is metric and I have no way to determine the dia. or thread count. I am however able to insert a #46 drill bit (with some play) #45 will not pass. Thickness of stock is .0725". Can anyone give me an idea as to what I am going to look for and where I might find it? Pilgrim