The two part head is much simpler than other puller assemblies
-The seat puller is collapsed to allow for insertion.
-After insertion, the seat puller expands into the seat.
-The allthread can be inserted after the seat puller expands fully into the seat.
-The seat is only ready for extraction after the allthread is fully tightened into the seat puller head.
-A simple "shake" at the top of the allthread will reveal whether the seat puller is engaged or not.
-Continue to tighten until the allthread no longer moves side to side.
-The seat is ready for the application of hydraulic pressure to the allthread.