I came on the need to do another very odd operation. I have figured out a couple of ways to do this, but ... well, I view the people here as a collection of Obi-wan Kenobis. I need to do two counterbores axially on the same hole. The hole is 0.25", the smallest and deepest counterbore is 0.375" for 0.097 deep, and the larger, smaller counterbore is 0.670" and 0.05" deep. The odd double counterbore is clearance for an oddity on an existing shaft that runs in the 0.25" hole, and is really necessary, otherwise the hacksaw would already have spoken. My thinking was to face the part, drill the central 0.25" hole, then counterbore twice, once with 0.375" and once with 0.670"-ish. First approach: turn a drill rod with the right diameters including a 0.249" pilot/guide, then file (no mill!) flats and shape two flutes for a custom counterbore; then harden and temper. Second approach: turn a drill rod with the right diameters then grind across the first 0.5" or so of the bigger/counterbore diameters but not the 0.25" pilot to make what amounts to a piloted D-bit kind of thing. The advantage here is simpler making as my skills are limited. And for both of the above, I'm a novice at hardening and tempering. Third approach: take one old 3/8" drill bit and an 11/16" drill bit, grind the ends flat, and shape for use as counterbores. Counterbore the two bores, 11/16" first, 3/8" second, using the fixed setup with the 0.25" drill, then the two c/bores in the tailstock chuck. This ought to keep enough alignment for them. Any advice, oh Obi-wans?