Gentlemen, A recent unfortunate incedent saw the trailer depart it's tow ball. It's not the best designed coupling I've ever seen. The problem is that the female coupling needs to be deeper. I should be able to do this in the press using a tube as the die but I need a 25mm diameter sphere (or part sphere) to mimic the tow ball. I can't use the tow ball itself as it's welded to it's mounting bracket and I doubt that would take the forces involved. Does anyone have such a thing or any idea what could be used? If all else fails, I could spend a happy (?) few hours on the lathe making something but turning spheres ain't easy. A ball bearing would be ideal but I've nothing that large.
John
BTW, it's a bike trailer like this
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no serious forces are involved but as we sometimes use it for carrying Mk1 son, I would prefer it stayed on the bike.