One of our American members put the thought in my head. Find a suitable wide ( well to us with 3" wide wheels) wheel. Remove the original centre and fit a Minor centre into the rim. At first I wondered about Cambridge/Oxford wheels but they are only 4 1/2" wide. Then someone said use a Transit rim, but that was VERY heavy. Then BMC said that he had tried a Vauxhall wheel that he thought was Cavalier. Bingo.
After a trip to the local scrapyard I bought 4- R reg Cavalier 5 1/2"x 14 wheels complete with 185/70 tyres. I also bought 1 Minor wheel, as I didn't want to butcher mine if it didn't work. So this is what I started with.
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I then, with a 4 1/2"grinder removed the centre from the Vauxhall wheel and, if you get a Minor wheel with rivets in, Grind the rivet heads off in the wheel well. Then punch the rivets through to free the Minor centre. You may have to cut the rim through to release the centre.
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You will then find with a bit of light, and I mean light, cleaning up. ( dont want to remove any metal fron edge of Minor wheel or centre of Vauxhall rim) that they fit together like this.
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Then all you have to do is find some reputable company to weld the 2 together. I found one that used to put bands in Land Rover wheels some years ago. When doing this you will find that you have to reverse the rim, so the valve hole is at the back. When your welding firm is welding the two together they can weld up this hole and drill a new one in the front. You then end up with this.
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Then as someone has pointed out you should get them crack tested and x rayed. Then I took mine and got them shot blasted and primed. At the moment I am in the process of painting them. Will take some more pictures at the weekend