One servo controls rudder movement but the second servo controls both sails bewteen barefoot and shoes. Rocketfish is owned by Best Buy which sells their tripods exclusively. They're self-locking mags and store 8 rounds each. http://globaleconomicdata.com/__media__/js/netsoltrademark.php?d=Raritetno.com%2Fuser%2FTuyetMadsen1000%2F