active lock for t5 timing belt

the locking posting is changed with the use of a mini servo (in this case a 22g 2.5kg/cm metal geared servo, or any 9g nylon geared servo will do). the servo is controlled by an arduino. the gear is a modified 14 teeth t5 pulley downloaded from this site, other parts are original. all the green locks in the pic are trial versions. the 3, 4 files make a lock that will be used with a front end stopper that will stop the lock when the belt is being pulled, while the 1,2 files will make a lock wit