Working on a faucet seat recently, I came up against a fitting that required a square-tipped driver. I didn’t have one that fit, but I did have an old doorknob with a square shaft. I used a grinder to shape one end of the shaft to the right profile, as shown in the drawing, and I was back in business.
Howard Furst, Bellingham, WA
Prescriptive codes don't address the connection at less common angles, so base the connection off more typical ones using bolts, structural screws, blocking, and steel tension ties.
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