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Step 11Structural changes
For the final design, I used a piece of 7" 24-gauge steel flue pipe. This pipe is nice and solid, fairly heavy & powder-coated black. Very attractive, but a little difficult to work with. I drilled 1/4" holes on either side, top and bottom, for threaded rods. The rod on top also passes through a large 32-oz yogurt container, which holds the batteries, inverter, and sequencer. I stuffed old socks in to secure the electronics.
There are four nuts near the center of the top threaded rod, which can be moved and tightened to fix the location of the suspension point. The seam down the side of the flue pipe adds weight to one side, unbalancing the pipe, so I needed to be able to adjust the balance. I also affixed some heavy washers along the bottom rod with wing nuts, so those too can be moved to adjust the balance.
There are four nuts near the center of the top threaded rod, which can be moved and tightened to fix the location of the suspension point. The seam down the side of the flue pipe adds weight to one side, unbalancing the pipe, so I needed to be able to adjust the balance. I also affixed some heavy washers along the bottom rod with wing nuts, so those too can be moved to adjust the balance.
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