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I had this problem on my '78SC. Prior to my ownership it had been broken into by forcing down the window. This damaged the mechanism; it was not only bent but fractured in one place which I had welded up, after removing it. Also bought a spare secondhand mechanism just in case it breaks again!
From memory the guides are adjustable so you might need to open up the guides a tad. Also you could try lubricating the guides with WD40.
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1959 Bristol 406 (bought in 1972; sold in 1977)
1966 Porsche 2.0 coupe (bought in 1977; sold 1981)
1978 Porsche SC coupe (bought in 1993)
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