Thanks to Mr. Boyd I found this sub-forum. Now, here's my dilemma. I have a PH 5C sight that wants a tiny screw to be put back to rights. The capture screw that holds the knurled knob on the shaft had the head broken off. My machinist buddy carefully removed the broken threaded portion, so I'm good to go if I get the screw. Pic one shows the broken screw in the shaft (since removed), Pic. 2 shows the location of the screw that I need. If anyone can help, I'd be most appreciative. Thanks for looking.