Uwe, we have on 07 Contessa and I have not had to manually operate the hydraulic slides, but have had to operate the bedroom slides. The packet of materials which came with our coach contained a flexible extersion designed to operate the passenger side rear slide. I believe it is a 1/4" hex, but has a female end. You would need a short, straight 1/4" hex to operate the hydraulic slide. I appreciate the heads-up and will be checking to be sure that we have the appropriate equipment onboard in case it is necessary.