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Using several people is about the only way to do it in most cases. It can take three people on larger slides. Odd that it would shear both sides at once. Lubricating the slide seals with a seal lubricant would help here. Thetford makes a good one. That is how we have to do this on Service Calls when this happens. Please get back to me if you need more input from me here as all follow ups are included in our fee.