The back edge of the rim needs to be shaped into a spherical contour to accept the back. The back is of course shaped into a spherical contour.
This disk with a spherical contour has sand paper attached. It spins, powered by an electric motor and the edge of the rim is ground to the proper contour
This interior shot shows the back glued on and cleaned up, more or less. A little sanding needs to be done to clean up the marks
Gluing on the back.
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