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I don't know about the Solas Rubex inserts, I'd just buy the complete kits, they are not that expensive.

Yes, the Rubex hub inserts are field replaceable, in theory anyway. Ken Reeves (aka Prop Gods) was the guy who turned me on to the use of the Rubex hub kits for shift dampening and Ken has told me the Rubex hub inserts really stay put because of the grippy rubber.

Ken sometimes puts the entire propeller in the freezer to make the hub contract and make it easier to drive out. Obviously that is not going to happen on the water.