I need to replace the seals in the lift cylinder for a JLG 40F and need help getting the cylinder open. The JLG parts page says it is made by United Hydraulics. It has a "thread ring" with 3 screws, (2) 1/4" x 1-1/2" cap screws and a small hex head 1/4" bolt. It looks like the cylinder end has an internal thread and that thread ring should just unscrew. I've put a lot of torque on it. First try was a tool made to bolt on using 1/4" bolts which sheared. Now I've tacked on a plate and 10' of pipe and can exert a lot of torque but it does not turn. So this is a pause to see if there's something I'm missing - otherwise the next step would be to apply some heat to the outside and get a longer pipe.