i have a service six, i am doing a complete disasembly. i went on you tube and i have a question. on my cylinder crane there are 2 little bearings at the end that the cylinder pops over and catches slightly. every video on you tube the people remove the cylinder so easy, on some the cylinder just drops off the crane. my didn't and won't do that. it fit snug but turns freely when put back together. are there different cranes? or is mine right or wrong? thanks