Originally Posted by cww516
i guess if you left it there for a long time, it could mess with the threads where the pump arm attaches to the back block, but beyond that, there shouldn't be much of a problem.
That should never happen if the block is spaced like it should be. Thats the only reason that happens is due to block smack. Pressure only would effect the time it takes for the threads to weaken to the point of failure.