First test was to try to cut a 5x10 screw for the points plate. I held the die in place with the socket wrench, while turning it with the JIS vessel screwdriver. Luckily, I was able to turn it by hand through the entire length.
I used a little WD40 as lube, and I would back off and resume any time it started to get hard to turn. Toward the end, I had to switch to holding it with a box wrench, as I think it bottomed out in the socket. But even then, it just took a little elbow grease.
When I was done, the screw turned very easily in the die. But checking it against the thread gauge, it was definitely not a clean 0.9 pitch. It wasn't 0.8, either, so the die definitely recut it a bit - just not enough.
I could hand thread it three full turns in the actual hole (points plate), but I didn't dare force it any further than that.
Asked for advice on Yahoo Groups and a good suggestion came back: find a long screw that has solid metal between the head and the threads. Cut the threads off, then use that to cut fresh new threads in the die.
So there's still some hope...
Also, the screws that hold the points to the plate are 4mm x 6-ish at 0.7 pitch (ie, NOT JIS). And note they have both a split ring and a regular washer.
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