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The castor is fine, as is the camber, i think the Kingpin is at fault.
I may try and cast an aluminium wheel, with the Gingery green sand casting method. I'll use the 'good' one as a template die.
I really wouldnt bother (unless you want to!) casting your own wheels. You can buy a heavy duty version of these from b&q (the grey broken plasticy bit is steel on the b&q ones). I have bolted many a wheel on to our welding sets