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turn the centre bore to the correct diameter
For a cheaper and simpler conversion, start with a flat HG sprocket like Shimano DX, the ID on the splines needs somewhere between nothing and a bit of light filing to fit the disc rotor register on the hub (assuming it has one, not all do) and you have no shoulder to take off.
gbj_tester
Will do.
My dad has just bought a lathe/mill so I figure if I can mark it up accurately I should be able to drill it accurately and then turn the centre bore to the correct diameter and remove the shoulder.