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Premium Member
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I am no 'expert' with these, but i have had them apart before.

The only thing that i can think of that could be making a noise other than gears or bearings, is the arm and brushes.

Remove the clip and take the top plate with the arm on the base of the top plate. Make sure that the brushes are not stuck to the base of the arm.
The magnets will stick to the arm.

With very fine emery or scotchbrite, clean up the comm on the arm. It may be pretty black.
Check out the condition of the brushes, they should be around 2-3mm thick.
It may be worth cleaning the brush surface, again with fine emery.
Fitting is the reverse of removal, just be careful when placing the arm back in that the brushes do not get dis-lodged or jammed.

Watch out for the very small springs under the brushes. It is worth doing most of this work in an old tin lid or similar so no parts get lost!!!

Hope this helps.

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