Thanks for the info. I have completed many three stage outer cylinders, but never a quad. I was a bit concerned with the removal of the cylinder. Usually do remove the entire cyl. and reseal the rod piston just to be sure it will not leak, but in this case if it gives me to much trouble, perhaps I will try just the gland or nut seals as you call it. My customer wants a price upfront, I will cushion it just in the case it takes 6 to 7 hours. Thanks again!