I haven’t found any place on the net that has a lot of info about 8x12 mods, so I thought I would post mine here.
While doing the initial cleaning, and busting my knuckles getting the chuck off, I decided my first mod would be making studs to mount the chuck.
I made the studs by parting the heads of some 50mm hex head bolts, and then turning down the last 8mm, so that the bolts seated against the bottom of the holes (the holes are not tapped all the way to the bottom).