MF,
I did repair an alloy base a while back that was badly worn on the front axle, so much so the front wheel had worn a hole through the base where it had been rubbing. I made up bits of 3mm angle to hold the axle in the right position and clamps over the axle to hold it on, then painted it with fish oil. Should last a lifetime now, it was a lot of work, but I believe worth it in the end.
