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The problem is the tubes are hollow dirt and moisture get inside make rust and slowly weaken the tubes. The tube is like a tailshaft its designed to twist to absorb shock. When you shorten the control arms you are increasing the load per inch of tube...
Welding stays in the corners will stop the tube absorbing stress the full length of the tube and probably result in the tube failing at the end of the stays were there welded on the tube. The best thing you can do is to forget welding stays in ... just fit a watts link setup to the top of your outer housing
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