JE Pistons Hooked Wire LockMost JE shelf pistons include double spiro locks as standard equipment. These locks are installed by spreading the lock between 1 8" and 1 4" and rotating the lock into the groove in the piston pin boss. Wire locks are installed in much the same manner but require chamfered wrist pins. Wire locks tend to spread side loads over more of the piston pin boss area and are considered to be a stronger method of holding the pin in place. Hook wire locks have