An update for this thread, I used an M10 rivnut off ebay it slides over the standard MX5 wiper arm screw thread. I araldited it to the thread. It has splines on so the TEX wiper arm just screws straight onto it,no welding required and it has a more postive contact with the windscreen. I'll update this post when I've used the wipers a bit to let you know how there doing as the car will be my daily driver
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