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Turning it over, we see the slot is unmilled, and not even centered to the key grooves.

In addition, the slots as supplied were barely wide enough for a 3/8" bolt,
whereas the standard for a Bridgeport or larger mill-drill is 1/2".

Anyone with a full-size mill (and admittedly the 4" vise is sort of intended for
smaller mills) would have to make new keys, turn a stepped stud, or mill the vise slots out.





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