The top shape is the top view and the bottom is the cross section showing the curvature to match the 7.67" diameter tube. I traced the top design on plywood and did a rough cut using my bandsaw. I then finished the top-down shape using my disc/belt sander. I then used the curved end of the belt sander to form the curvature of the bottom shape.
I center punched the hole in the top and drilled a 1/8" hole through it. I then marked the sustainer tube both 4" and 29.25" from its bottom (into the centering ring plywood) using a 90˚ strip of extruded aluminum and center punched markers there. I drilled a hole in each 1.1" deep and sanded the area around these holes. I applied epoxy to the bottom of the standoff, mashed it down on top of these holes, and screwed 1-3/4" machine screws through the rail guide/standoff and into the 1.1" holes. Since these assemblies will need to support 40+ pounds of weight they had to be solid and I'm confident I achieved that goal:
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