remove the C Clip from the carbon seal assy.
Pump was glued on so tight 2 days of messing with it.........Thread the 4 pieces on the pump, mark and drill your holes in the wood, slide the wood on, attach washer and nuts to each piece of all thread and you have a home made pump puller.
Are you talking about the o-ring that sits under the front of the stainless ring seal carrier?
....If not I don't see any metal c-clip in person or on the parts fiche.
The O-ring is updated to the C-Clip. This allows for replacement without having to remove the shaft. Also, the O-ring style has been known to fail and then the ski is pretty much an anchor,,,,
Before you go building the "puller" just make sure you removed everything I mentioned and just grab the pump and pull back and keep pressure on.