I remember your post when you described this once before......and a few months later I bought the APS bench priming tool.......Really got to say I like it better than any other way to prime, but I've worn out my plastic sleeves already....and I don't know how to braze bronze like you did (yet). Just need to rattle my cage and order some more plastic ones.....or try your method using a drill press. Gotta learn how to braze though. I'm assuming that means you buy dedicated shell holders for the priming tool's use? Brazing rod and welder's torch, right? Centering jig for the drill press needed, right? The right tools would be easier.....just don't have them.....I'm a wood worker, not a metal wizard.
Yes, the shell holders will be dedicated to the priming tool and the primer size.
I bought some 1/4" diameter bronze or brass rod which fits nicely in the hole in the shell holder. I tig brazed the rod into the shell holder filling the back of the shell holder with braze material to fill the cone section. Then, I used a 1/4" dia end mill in the lathe tail stock to clean up the top side of the shell holder/bronze insert. The back side, I'd turn the bronzed filler to be even with the sides of the shell holder. The appropriate hole would be drilled through the shell holder, the back side "funnel" would be cut with a 90 degree or so counter sink. Smooth out the rough edges.
On a lathe, this is easy.
On a drill press, you have to set up the vice to hold the shell holder in advance of filling the hole so that after the hole is filled you can set the shell holder back into position to be centered on the drill bit. Some of the smoothing and rough material removing can be done by hand with files and emory cloth.
JB Weld can be used in place of the bronze but I do not know how long it will last and need to be replaced. JB Weld does not need any welding equipment to install. Clean/degrease the shell holder, mix the JB Weld and apply.
My first test was done with JB Weld to test out the concept. I ran a 1000 or so primers through the JB Weld test shell holder and there was still lots of life left in the JB Weld. But, you can see the primer and tool wearing away the JB Weld. It may get to a point where wear is minimal and it will last a looooog time before it needs to be replaced.
The same finishing procedures as stated above apply but the JB Weld can be worked with hand tools more easily than bronze and can be installed without any tools. Just do not get over zealous applying the JB Weld so that there is not as much to remove. The main thing is to make sure the through hole is as centered as possible in the shell holder. The rest of the finishing does not need to be as precise.
In the previous thread, I mentioned the size drills that I used for large and small primers.
Hope this makes sense.