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 with an axial through the holes at one end of the lock. the gear is for changing the direction of the loose end of the belt, not for force bearing. the belt works as a tendon on a robotic limb.