Step 3Detail of the axle wheel attachment.
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this is the hardest bit of a trailer. you need really strong axles if they are going to be cantilevered like this. hardened steel axles greater than 10mm in diameter are best. you can potentially use two old front wheels from bicycles, the difficulty with this option is making the axles work in such a way that you can fasten them either side of your bike. In Guyana i saw a lot that used two old front forks welded to the sides of a shopping cart, and similar such ideas. Anyway, in this one I used the half inch steel pipe through the centre of a half inch bearing 24inch wheel, and merely put shaft collars with locking allen key thingies either side of the hub. the axle was then convenient and easy to stick to the 8020.