Clutch lock screw does not open

Hello, I’m driving a Baotian scooter 4 times, which I only use to go fishing.Had him a few days ago in the workshop to make a new V-belt and vario weights on it.One day later the V-belts tore.I pulled a new trüber – but the scooter doesn’t come from the spot and just stutters.The rear wheel turns very fast.That’s why it would now also hang on the clutch-trying to get the screw on by all means-just noch Once again I don’t drive to the workshop – these are huge costs – so I try it myself.Until now, however, I had found out that the Variomatic disc was loose after the repair. anyway, I have no doubt that the workshop screwed up.Do you have any advice?