Abstract: A broach pulling mechanism is provided utilizing puller jaws which engage with a significantly larger circumferential groove at the end of the broach to pull the broach through a workpiece without any vertical drop of the broach in the puller mechanism during any part of the broaching operation. To accomplish this a piston assembly is mounted at the bottom of the broach pulling mechanism to allow the end of the broach to bottom thereon. The piston assembly is controllably pressurized to lock a wall of the groove of the broach end between the puller jaws and the piston assembly thereby preventing any movement or dropping of the broach due to a loose fit of the jaws with respect to the groove throughout the entire broaching operation.