In one of those chicken first or egg events, I acquired a set of DA 100 collets long before I had a use for them, or even anything in which to use them. When I finally got around to making the vertical head for my milling machine, naturally I used the collet on hand. At 3/8” maximum capacity, though, they have been rather limiting, especially as I have a Number of .5” shank straight milling cutter, dovetail cutters, and keyway cutters. I did plan ahead in making the milling head, planning on some day getting a set of DA 200 collets. Someday arrived a few months ago, and now I have gone the next step; disassembling the milling head, modifying the spindle for the larger collets, and reassembling the head. Another round tuit taken care of.