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The o-rings under each Dzus quarter turn fastener head are vital components in the water resistant seal design.
These o-rings are coated with Super Lube synthetic grease at installation to insure smooth fastener turning while at the same time resisting water penetration into the canister.
After a few seasons you may want to remove the snap ring and clean the fasteners, o-rings and seats if you notice the torque has grown uncomfortable.
"Re-greasing" of the o-ring seals must be done with Super Lube synthetic grease or equivalent.
Bearikade Dzus O-Ring Maintenance PDF-94kb