I had my orignal actuators & on those, the upper/inside seals did not slide at all. They had a extruded lip that fit into the grove on the shaft. the basically turn themselves inside out when going up & down like pulling off a a sock form the top.
The aftermarket seals slip & slide. Not because they are supposed to but rather because they are cheap stretchy rubber that won't sty put. I had troubles with my repop actuators & fought with them for a while. Finally took the orignal seals from the old units & now they work perfect. Amazing that 51 year old rubber is better than the new (China) stuff.
Im Just kidding.... It's not surprising at all... lol
