Turntable won't turn

There is usually a cotter pin at the center of the platter around the spindle base. This can be removed with a screw driver using a twisting motion. There is a blades worth of space between the clip and the spindle base. Screw driver should be in vertical position. Sometimes the vinyl slip mat must be removed first. Watch that clip, cause it can go flyin. Once the clip is removed, the turntable should let go easily.