[EricH]

They ARE legal. As follows:

1) They are a COTS item (which are allowed unless specifically restricted).
2) They do not use an illegal motor.
3) They do not meet any other criteria for being illegal that I can find.

Trust me, if the only actuators we were allowed to use were the ones in the table, I could make a pretty darn good argument that pneumatic cylinders and gearboxes were also illegal--after all, both actuate something!

Try thinking of them as a gearbox that provides linear motion instead of rotary motion.