Atlas MF mill spindle pulley conversion????

First thing that I would do is order the two bushings (and two or three of the M6-255 Fiber Washers) from Clausing. Then I would look at the required pulley ID to fit the bushings versus the OD at the smallest pulley step. If it appears that there would be enough wall thickness left, I would bore the pulley to take the bushings. And use the small spindle gear from the flat-belt pulley that you have. If that doesn't work, then I would try machining the flat belt pulley. You will have to try to find someone who has an actual M1, MF or MH to get the four diameters.
 
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