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i think he's talking about the actual shift lever, not the adapter that spines onto the shift shaft.
the slop is caused by wear. it's just a simple shouldered bolt and bushing fitment, so as things pack out it'll get loose.
OP it probably won't cause any trouble, but you could look into fixing it. i don't know off the top of my head, but is there a bushing in there? if not you could look into drilling out the shifter and installing a brass bushing to tighten things up