Reminds me of the time the passenger-side wiper froze to the windshield of my Volvo and then stripped. Fortunately on that car they made the wiper arm centers out of soft metal, with the idea that if they stripped you'd just reposition it, then tighten it down to cut new splines.
__________________
N8SRE
1990 E-250 Sportsmobile w/ penthouse top, converted when new by SMB Texas.
If the pivot still moves freely, it’s prob just a broken plastic wiper arm bushing. They get old and brittle, break and let the linkages fall off. Cheap and easy fix. Look something like this,