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You probably shorted something out with that screw.
The speed is regulated by the capstan and a complex electromechanical feedback loop that takes in speed sensor, tape signals (control track, etc.), etc. and adjusts motor speeds etc. accordingly. Several different things could be bad, but it's looking like most remaining possibilities are electronic....Those circuits require quite a bit of VCR specific knowledge and test equipment to properly troubleshoot and adjust...Enough so that it may be better to just find another VCR....
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