axially interconnects the upper piece 24 with sleeve 30 which has port 33 therein the sleeve 46 is biased downward by coil spring 42 see fig1 c which acts on pusher 59 which acts on a roller which is part of cam assembly 82 the cam assembly 82 is attached to ball 52 via a screw the spring force applied to the sleeve 46 pusher 59 and cam assembly 82 holds ball 52 against sleeve 56 which is pinned with shear members 64 to sleeve 44 sleeve 32 is prevented from downward movement by the shoulder 27 on housing 12 adjacent head 26 the ring 38 at the lower end of sleeve 32 is contained by snap ring shoulder 40 on housing 12 and by sleeve 32 the ring 38 also engages a lower shoulder on the sleeve 44 to prevent upward movement of the sleeve 44 port 33 in the sleeve 30 port 47 in the sleeve 46 port 45 in the sleeve 44 and port 49 in the sleeve 46 see fig1 a allow fluid communication between the interior of the tool and the chamber which houses the spring 42 and prevent pressure lock during actuation of the tool referring now to fig1 c the ball 52 includes a pair of cam assemblies 82 fig1 c shows a small diameter port 55 having a seating surface 54 therein fig1.