babar, the pulleys have to swing around the column to allow you to swap belts on the pulleys. There should be a spring loaded plunger behind the unhinged side of the motor mount. It should have a locking screw to lock the plunger in place. What you do to change speeds is loosen the locking screw, push the motor back toward the mill head and lock the screw to hold the plunger back. That should loosen the first belt. Then you loosen the two screws that hold the idler pulley bracket and that should let you swing the pulleys to loosen the other belts. Rearrange the belts to the speed you want. Then loosen the plunger lock screw and the plunger will push the motor mount out tightening all the belts. If you want you can pull out on motor mount to put a little extra tension on the belt and then tighten the locking screw to hold the tension. Then snug the bolts that lock the idler pulley bracket and you are good to go. Hope I explained it good enough. If not I can take some pictures. Changing speeds is not that big a deal and once you have done it a few times it is pretty fast. One belt from the small pulley on motor to any of the pulleys on the spindle will NOT give you the highest speed. To get the highest speed some of the belts will go from a big pulley to a small pulley.
