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Changes to Step #3

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[* black] Weld 3/4" nuts to the outside of the U channel where the holes are torched.
[* black] Weld it with a bolt coming thru the other side so it protects the threads and so you know the nut won't get off center.
[* black] Grind away any spatter between the bolts.
[* black] Make (4) 3/4" x 3.5" bolts using 3.75" threaded rod and steel nuts. See [http://opensourceecology.org/wiki/Making_Bolts|Making Bolts.]
[* black] Thread the bolts through the nuts and thread another nut on top as shown.

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