Thanks! My guess is the pump was actually much longer in real life (to reach the depths of the flooded mines), but I guess I just made it that length since you wouldn't be able to see the rest anyway.
Glad you found it entertaining. :) What's really fun is when the piston glitches out of its housing but still thinks it's supposed to get a periodic downward force, proceeding to swing the beam all over the place. haha