Just take it back to were you got it from and have it replaced, we have laws in Australia if you people didn't know. Demand a new unit as more then likely a metal fragment has got caught between the worm and worm gear and probably damaged both leading to bad PE. Let us know were you got it from please.
BTW: 1 bad mount doesn't mean there all bad, hell every product has a fail rate even the very best mounts could end up with a bit of metal swath in them.
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