I appreciate the help. I kind of boxed myself into a corner with this deal. I added an aftermarket 3 jaw to my GT-10 (A2-5 spindle) and had to use an interface plate supplied by the chuck manufacturer (Bison). In a fruitless effort to get the thing to run true and stay there I put the interface plate on the mill, probed it in, and located 2 dowel pins in it. I then did the same with the chuck and reamed holes .001 larger to locate the chuck on the plate. So ---- hammering on it should not move things much Of course, all this assumes the plate OD was true to aligning taper in it, that the OD of the chuck was true to the scroll/jaw location, and that I did not screw it up somewhere.

I thought about gluing my Dremel tool to the turret and grinding a little and that's starting to look like the best solution.

Everything was brand new but the scroll might be off as well but I would hope their tolerances were better than that.

Vern