I suspect the problem you have is a stretched drive belt (from the power motor to the slide change mechanism). The good news is there are still parts available from: www.micro-tools.com The problem is the replacement of this belt is a involved disassembly - at the very least you would need great mechanical aptitude and (most important) a service manual. I would recommend locating a factory-trained service dealer to make this repair for you.
Good Luck !
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