Actuator for Swing Down Jack

[Curt Sprenger]

One front swing down leveling jack is leaking oil out the Actuator
bottom cap breather hole. This means the internal seals are leaking. HWH
sent an Actuator. There are two little round things, about a dime or
nickel in size, with o-rings, that fit between the jack and the
actuator. They look to be a PITA to change without removing the jack.
Has anyone changed an Actuator? Can it be done on the vehicle, or should
the entire jack be removed?
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Curt Sprenger 1987 PT38, Anaheim Hills, Calif.