I was trying to explain a set of wheels i made for my old yak on a post Softy has started, and thought rather than hijack his post i would post it here.
I got this design from vic kayak fishing (vyak.net), used items. 2 green machine wheels (kmart $8 each), a length of 12mm allthread, 4 m12 nuts and washers for axel, a length of 25mm ID high pressure pvc pipe, 4 pvc T joiners one 10mm waterproof yoga matt (high density) pvc cleaner and glue, a 1 ltr tin tarzan grip or similar glue. Optional 25mm dowel, to strengthen axel in pvc and spaces as required.
Note the bottom T peices could