Our drives that came with our Oasis 2010 are new and never used (everything is frozen outside
While checking the drives I dicovered a "thunk" on both of them.
It's the pin from the pedal adjustment assembly that moves in the selected hole from the drum.
When changing direction with the pedals, the pin moves from one side to another in the hole (less than 1mm), at the pedalend it gives a "thunk of 3mm.
As we never used our drives in the water, I'm not sure at all it will be felt in normal use because you normally only push on the pedals.
I wass told sportcyclists also pull on their pedals with the pedalstraps, they will certainly feel the "thunk"