scout drive belt keeps slipping off

Yes the smaller top is the 33rpm spindle, the belt should rest on the lower shoulder of the bottom of the top spindle. The lower larger diameter spindle is for 45rpm. I have never tried the larger, as I use a SDS to switch speeds. I hope this helps???

as audiobugged stated you may have to raise or lower motor to line up with groove on platter,also rather than turning on motor,turn platter slowly by hand,you can also put your hand on top of the belt lightly next to pulley to keep it from jumping off untill it moves to the correct platter groove ,by turning platter slowly by hand you will be able to see why the belts coming off,hope this helps,,

Good Advice Ray!