I don't think that your problem is mechanism. Worn our gears and bent items indicates that the slide is not sliding, but binding. This might be difficult to troubleshoot but I think if you don't find causes, the problem will start again. Is the slide square? Isn't it wider inside than outside wall dimensions. Don't laugh, everything is possible on Thor products. Is the mechanism the original design or was it replaced several times before? It could be also underated type for given application
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