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He shouldn't be touching any part of the movement with his fingers, use a plastic stick, or finger cots if you really need to handle something. Also shouldn't be dismantling or assembling the auto mech without the support jig, or using steel tweezers on the bridges.
Not completely dismantling the winding mech and removing the stem before putting movement in the cleaning is machine is also lame.
And why are the components just lying around on the bench after they've been cleaned, keep them in the cleaning basket and use a dust cover.
The more you watch etc.
^^^ Look at his horrible finger nails.