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It may be the pin that locks adjusts the tension of the worm is loose. Its a bit hard to tighten it up hard.
There is a video for adjusting this pin. From memory you take off the motor cover and you'll see 2 pins and a threaded bolt. The pins need to be mostly all the way down but they seem to be able to pop up over time. Loosen it off push the pin down as far as it will go and retighten and then put the cover back on.
See if that works.
Greg.
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