Ah don't tighten the clutch....you have to service the sunroof....you will need to remove the roof, remove the motor, dis assemble and degrease everything and then re-grease. I use white lithium grease.

This is totally typical, after all these years the grease gets old and filled with dirt/grime and will cause sunroof issues...

Here's a DIY on removing the sunroof and the pdf on how to unlock the roof to get it out..

PeachPartsWiki: Sunroof Repair

77-100.pdf

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