We recently went through this tube removal and replace thing and found out a quick way to get the lower tube off and back on again. We simply took a small screw type hose clamp and clamped it up on the steel tube down near the bottom, then you can go under the car , place a long steel rod against the screw on the clamp and strike rod with hammer. Tube pops right off. When you're finshed replacing the "O" rings, use the same steel rod to strike the screw clamp from the top to drive the tube back onto the pan tube. Leave the hose clamp in place when you're finished.

Ben
www.reproduce100s.com