[Al Skierkiewicz]

Creating pressure using mechanical force on legal pneumatic component has been deemed illegal in the past. Reasoning behind such a rule is the possibility of a pneumatic system already at full pressure, with flow restrictors, could conceivably exceed system pressure of 125 PSI if pushed on with enough force.

Also, until last year, pressure modulators were not allowed. Last year, a few changes in the rules did allow them and I remember seeing one robot that had somehow controlled a pressure regulator to achieve a desired effect. I don't remember if it proved advantageous or not.