Shogun Warrior repo left fist is designed for Mattel Shogun Warrior 5" scale figure Dragun. It has been designed so a spring can be fixed inside using the Lockkey, or can be used without a spring. To fit a spring. 1) First find a spring with a suitable diameter. 2) Then if you need to, using some pliers cut to fit. 3) Now at one end of the spring bend in the middle of a coil to make a loop. 4) Slot the spring loop through the slit inside the fist. 5) Insert lockkey and twist to fix spring in place.