In the pic, the one on the left is the starboard wheel.
I've just fixed mine after the first outing.
Three of the 'rivets' came adrift and almost trashed the wheel - and water poured into the hull from the paddle boxes.
The cures are fairly simple. Dump the rivets and assemble your wheels with stainless M2.5 x 10 pan head screws and nyloc nuts. Check they are the right way round to clear the arms, etc. Tighten until there is JUST free play.
The inside of the paddle boxes will not only need an L shaped lip over the deck edge, but will need silicon as well to keep the water out.
Last time out (Mayhem) I had no water ingress and the wheels stayed together :)
Cheers
Danny