If your step slide is leaking in the retracted position extend it out and then from underneath take the nut in the washer off of it that holes it on the bracket that attaches to the floor itself. pull it back then take the other nut and washer off so that you just have a naked Ram with threads on the end of it then slip a very small o-ring that is snug and a flat washer that fits perfectly tight to the diameter of the ram. Put the O-ring on there put the washer on there I believe it's a metric washer is the one that's going to fit perfect unless they've changed the Rams. Then put it all back together the way it was and when the step retracts the flat washer squeezes the o ring sealing the leak. A perfect tight flat washer is vital or it will cut Into the o ring after a few cycles.