Finished making the last part for this project. A shouldered pinch nut to retain the ejector rod housing with minimal movement under heavy recoil.
A section of good La Salle fatigue proof steel. I like it because it makes great pins, screws, firing pins and takes a fine thread that is strong. Polishes decent too.
Turn a nipple in the drill press that fits the drill bushing for a 31 drill. It'll get the hole well centered.
Install the steel rod, nipple first in the drilling jig and drill the 31 hole to whatever depth is needed.
Nipple is gone and the tap size hole is properly centered.
I tapped the threads with a bottoming tap using the drill guide for a 28 drill to guide the tap into the 31 hole.
Now, turn a shoulder in the bottom of the pinch nut that just fits the hole in the bottom of the ejector rod housing.
Then in the drill press I turned (filed) the 1/4" major diameter of the pinch nut.
After shortening the shoulder and the head of the screw to the proper lengths, I place the pinch nut in a 1/4" dia hole and neatly saw in the screwdriver slot.
Final polish of the pinch nut, check fit, some bluing and finally.......Packhorse is ready for testing at the range!
Its a long way from a hack barreled gun with a screw sticking down into the bore! Some shooting time and some wait time to monitor the brown and I'll call it done, likely in a week or so.