the drive normally lives at the end of the shaft , the end far away from the starter. it sucks in toward the starter to engage,. when the engine starts and overspeeds the starter, the drive is unlocked to fling back out to the end of the shaft.
if yours is engaged.. you can overspeed it on a wire wheel on a bench grinder usually.
note.. the shaft must be squaky clean.. no rust.. no wet lubes like oil or grease to provide drag friction. dry lubes like silicone spray may be acceptable. also.. is the bushings are worn, or the shaft is bent.. it will cause side loads and other issues.