Needed another item to get free shipping, so I bought a Edge Pro Mill Stop. These mill stops allow you setup work in the vise at exactly the same position for repetitive operations. I wanted the table version so I didn't lose any Y-axis travel.
This stop was designed for the standard Bridgeport 5/8" T-Slots, but my mill uses the smaller 1/2" slots with 3/8" studs. It shouldn't be too hard to make it fit.
https://www.edgetechnologyproducts.com/pro-mill-stop/
First the socket head cap screw was held in the ER-32 collect chuck and turned down and single-point threaded for 3/8"-16 threads.
The key in the base was milled down to fit the 1/2" table slots. Since it was specifically for this mill, I was able to get a very nice fit.
And here it is installed. I've needed one of these a few times in the past and this stop is versatile and very sturdy.