The wedge from what I could decipher from the samples, starts at the bottom of the mortice (.050” thick) with a slight taper (.090” thick) to almost the centerline of the bore where a radius (around .250”) takes the dimension out to about .230” thickness on this wedge. This dimension is carried up straight to the top of the mortise. This wedge, is attached to the receiver by two screws coming from the outside of the receiver in. In the actions I’ve seen, these screws appear to be straight across from each other like maybe the Bros. drilled straight through? The wedge appeared to have a little movement and if a person was to drill these somewhat out of line from each other, the wedge would be held a little more rigid?
The block now is where the fun begins. Making it to fit the mortice, matching the taper, and getting it snug when raised to battery, sounds simple doesn’t it… how close and smooth do you want it to be? It’s a process and I’ll go into more details about this as it develops - it’s hand fitting with a fine tooth file and small stones.
I decided that before I could cut the slots for Freunds double extractors, I needed to machine the threads in the action. The original Sharps call for a 1.125” x 10 thread per inch modified square. I don’t quite understand what’s modified about the square thread but I cut mine to standard square thread dimension. That’s using the formula of 1/2P for depth and width. My odd-ball fixture makes setting up this in a lathe a fairly simple operation. Another note here, it’s my guess here that the ODG’s used the square thread based on the theory that they didn’t exert any outward force on the receiver like a v-thread would do, and majority of the force and stress applied was in a linear direction.
My next step is to cut a relief for the extractor cut, then the extractor cut in the action casting all so I can locate the cuts in the new breech block for the same.
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