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Starting a Handmade Business
I highly recommend a dog leash swivel for hanging. I've used fishing swivels up to 35 lb test on relatively small spinners, but when the wind gets strong, say 40 mph or more, the loading is too much, especially after a year or two of wear, even when oiled regularly. Go extra strong to be sure it won't blow down.
To check for squareness of the subassembly, measure the diagonals and adjust until they are equal. Use a framing square or a right-angle template you make to ensure the legs are square to the aprons.
Welding Class Capstone Project
Tools and Materials for CNC
How to Make a Picture Frame Table Saw Sled