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![Need to join 2 perforated square metal tubes at at 90 degree angle and limit rotation at that joint. Any ideas for how to connect the two pieces of tubing, aside from Need to join 2 perforated square metal tubes at at 90 degree angle and limit rotation at that joint. Any ideas for how to connect the two pieces of tubing, aside from](http://i.imgur.com/7wZxKoL.jpg)
Need to join 2 perforated square metal tubes at at 90 degree angle and limit rotation at that joint. Any ideas for how to connect the two pieces of tubing, aside from
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