Next, I tacked the diagonal braces into place. With the 45 degree cuts on these braces, the relative squareness of your base will be immediately evident. If the braces don't line up on the upright, it isn't square. Fortunately, mine lined up perfectly, a testament to taking your time and making things right before you do any final welding.
The next step is probably the most difficult part of the whole job: cutting the "cradle" that the rotating sleeve fits in. I used my Sawzall to trim it close and finished it with a cylindrical die grinder bit. It is important to note that if you're using my design, carefully locate the rotating sleeve--it isn't quite half-way set into the upright, so don't make your cut too deep. Make it too shallow and gradually widen it with the die grinder to make a perfect fit.
Before I tacked the sleeve in place, I placed a level on the base and leveled it using a few small pieces of sheetmetal. Once the base was level, I placed the level on the sleeve, leveled it and tacked it in place. Why is it so important to make sure everything is level? Since the sleeves on each end need to be on exactly the same plane, any tilt to it will induce bind into the apparatus. If there is any bind, it could add some torsional stress to the body once it is in place and make it more difficult to rotate. Making it as perfect as possible will give you a better chance of avoiding problems (this is a lesson well-learned in my days as a carpenter).
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