Hi, I saw you reply to my thread from when I had a similar problem.
I ended up taking mine back to the shop and they fixed, its turned out to be the Gear Mesh. I did get them to show me how to fix it.Also had some tips in my thread.
Basically they loosended the motor, then folded an A4 piece of paper and but inbetween the Pinion Gear and Spur Gear/Slipper Clutch and then moved the motor into position. Then re-tighten the motor and roll the gear round to remove the paper. The mesh should sit right then ( Mine sounds fine so I guess it works).
My Slipper was way too loose as well so might want to check that.
I am a total newbie to this but I think i managed to understand them lol
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