Hi, last time I had my gearbox apart I found the spur/slipper shaft pinching up in the housings when I tightened the motor plate. All the original clearance had gone. I.e. try wagling the spur slipper assembly in and out of the housing when assembled. There should be a little bit of axial play. I had to put 3x0.8mm thick spacers between the 3 pronged yokey thing and the gearbox housing to stop it pinching when tightening the motor mount screws. I put it down to the plastics just giving a little over time, surprised it happened on a new one!
Hopes this makes sense, I'll try and take a picture later.
Paul
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