There's no video - what do you mean by the rod? The part of the slave cylinder which pushes out? I'm not sure why your mechanic has done this, there is no need, a slave cylinder from 156 V6 is the easy answer.
If the clutch is not returning it could be that there is something preventing the fluid from flowing back out of the slave to the master cylinder. Maybe a master cylinder fault, maybe the flexi pipe was clamped and it has kinked in, could be a problem with the 'valve', in the clutch line, could be letting air in somewhere. Does the clutch sometimes work OK and sometimes not? Or is it sticking all the time?
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