Being Lunt's oldest Oz dealer, it's been a while since I did last this job...but...if memory serves...
Remove the pressure turning cylinder cap from the central threaded section.
The location of the old rings should become apparent. Remove them.
I'd clean up the inner cap and central threaded section with a microfibre cloth soaked in isopropyl.
Fit the new rings.
Lightly re-grease.
Re-assemble.
Merry Christmas.
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