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I used echobits measurements and built bolt on flips out of 3/8ths steel plate, the design doesn't allow mine to move like his did neccesitating welding them to the hanger so they didn't move. ... Check my sig for the first design.
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I can vouch for that. I have a set of backyardbuilt's flips. Never had a problem with them. Gave me the lift I wanted, and are extremely stout.