Lately I've been buying random wheels on ebay to make myself a set of disc wheels for my buggy for harder packed sand, and have discovered bmx mag wheels, which I've discovered have a big enough bore through their hubs to allow a 20mm bolt through with some clearance, and since the old mans now got his lathe just about working I purchased some Nylatron from theplasticshop.co.uk to create some bearing housings.
So far its going well, heres an example of one of the wheels as it stands at present:
