I wound up getting the RCBS military crimp remover.......which also has the fine 8-32 threads. Dropped by the hardware store, found these and found it will screw on and chuck up in a drill. Right hand threads, which when coupled to the clockwise turning tool (when viewed from mounting screw end), resistance of the tool when working on the brass works to tighten the nut, so is not going to come off in use.
In use, RCBS crimp removing tool seems to work fine. Has 3 cutting blades, self centers and since the depth is controlled by head stamp turning on the flat base of the cuter, it can't cut too deep. Tried it on some commercial brass for comparison, and it barely scuffs the edge of the rim. Also tried it on some freshly fired LC brass, which should have had a crimped in primer. Only slightly more pressure needed to extract them, and no visible crimp or lip. Not sure is that sample of LC brass needs a crimp removed. And it is not the long range designated. Straight LC brass. Did have the small dots on it.
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