Mamiya ZM Problem

I have a Mamiya ZM that looks pristine but has fallen victim to the floppy wind lever that this model seems to be notoriously known for. The lever seems to become disconnected internally and has no resistance whatsoever, so the shutter cannot be cocked. I tried buying a winder for it thinking I could just bypass the lever completely, but no luck.

Has anyone encountered this in this problem in this model and, if so, were they able to fix it? Thanks!