i switched from drilling them on the lathe, to the drill press, when i found the through holes (not that big a diameter as that, would have a tendency to go off track with the ambrosia maple. that, and the smoke. also, the salt mill bodies have to have 2 insets made for the mechanism, plus the through hole for salt storage. the inset for the pepper mill is 2 inches in diameter, and only 1/4 inch deep, for the salt mills, the top inset is 1 1/2 inches, and 3/8 inch deep, and the bottom one is 36 mm wide, and 3/16 inch deep. the through holes on each, are 7/8 inch in diameter, and for the pepper mill 4 inches, and salt mill 3 inches. each of the through holes are drilled half way from each direction, and meet in the middle. that way, each is centered by the marks from the drive, and live ends. up until this latest batch of ambrosia maple, they have cut rather nicely, starting and finishing in seconds, without catches. this batch was like trying to drill through wood harder than white oak. clamping the finished bodies would have been difficult at best, and certain to leave marks. as i have said before, i needed a little extra help in holding the bodies, and my fingers came nowhere near the top of the bodies, and definitely nowhere near the bit, and very little pressure was used while drilling.