The shutoff shaft is connected to a stamped steel part inside of the IP, not sure how it's connected whether it's welded or removable but IIRC it is permanently connected (swedged, welded, other?). In this case replacement will require it to go in, not out. If you pull the "seal nut" (bushing), it does not give enough clearance for the stamped arm inside to come out. However, this bushing is held in place with some loc-tite, and you will need to remove the lock-ring before turning this bushing, and ensure that you are not putting any axial load on the shaft while you remove the bushing or you will bend/damage the stamped arm inside and possibly other linkage parts.

Check to see if there is a snap-ring and spacer/washer installed on the shaft against the bushing, there is also an O-ring just inside this bushing. If all are not present then this is your problem. Also, slide the shaft outward and see if it still binds.

I am curious how the shaft is attached to the stamping inside the pump, might pull the shutoff actuator off of my spare today just to find out, will let you know if I do.

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- Jeff