After the cap and cup and removed, the next item to be unfastened is the upper piston. It is suggested that all maintenance personal utilize the Extrude Hone piston assembly install/removal jig.To remove the upper piston, place the removal jig on the machine’s lower piston assembly, without the keeper attachment, and ensure that it is concentric with the upper piston’s raised center.With the jig installed, slowly advance the lower piston until the upper piston’s raise center is inserted within the jig’s body and the is just about to touch the jig.In this position, remove the cap screws that fasten the upper piston to the upper keeper and allow the piston to rest against the jig.