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Back gear

Thanks guys,
Actually, when I engage the back gear and run it, there's a knocking sound, metal to metal once every rotation it seems; I can feel it by touching the engaging lever; I've played with the eccentric bush next to the lever, but no difference.
The lathe is sold, but I'd like to fix it; any idea how to remove the lever for a close look?
 
Update:
I removed the eccentric shaft, the back gear module, inspected everything and couldn't find anything making contact. After re-assembly, I ran in backgear, the knocking was still there until I lightly grab the chuck and applied a light pressure; the noise stops instantly; I guess it's the backlash in the gears doing it...
 








 
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