In reply to cochise' point about endplay I tried to move the cylinder up and down just like you described. I can feel it move as I pull down and if I look I can maybe, maybe, see it move ever so slightly. I can here it too, but only a small noise. I have no idea of the spec either but it would make sense to me that a little play is what you want. Like I say, I can't see a big movement and I have to pull fairly hard to get the cylinder to move back.

Thanks again.

Rob in Texas.