If it feels like the worm is trying to dig into the worm wheel when turning the motor by hand, ever so slightly loosen the motor mount screws one at a time. If this seems to relieve the “pressure” then temporarily make you some paper shims and shove them under the motor mount in front of the screws, ever so slightly raising the nose of the worm off the wheel....not too much or she’ll be a skippin’.....
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