It might also be that the tension is just out of adjustment. When I was at TM on my ill-fated trip, the tech told me they zero the tension (shell up) on the arms and apply the same number of turns on each bolt.
That fixed things wonderfully for me.
When I saw them leveling the shell, they used a floor jack and block of wood on the piston. They took up the load on the piston, then carefully adjusted the shell, locked the shell, and then retracted the piston.
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