The vac head is what I just milled out! I’m printing Ryan’s 660 mount right now. Will use the clamp I have now for the vac head, pretty sure it will fit. I’m also pretty sure some of the extra torque on the head was the bit I was using. Roto-zip bits aren’t really made for wood! I can’t really bring the gantry down much more, if I do the z nuts fall out, and holy crap that’s a pain to put back without taking everything apart!