On my Marine Trader there are wood screws facing forward on each spoke on the hub. I use a 90 degree screwdriver to give them a 1/4 turn every year or so. They tighten up nice.
Hello lanceolson
We have a 1989 36' GB/EU and at the ends of all the spokes on the wheel outside,
their are bungs covering what I presume to be adjustment screws. I would be
very careful drilling these out, but its like doing the ones in your deck.
Hope this helps. Will