You can go as simple or as boujie as you want with a DIY axle. Just a 1.5” pipe is technically all you need. You can spray paint or powder coat it. You can make collars out of duct tape, clamp on fittings, or welded rings. You can make the usual knurl mark spacing or leave it bare. It can be an easy little DIY but it’s also often nearly as cheap to buy an import from Titan or others on sale
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