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Component parts of the device. 

The hold-down ring is a piece of 3" OD steel tubing with an 0.085" wall.  Two tabs  made from 1/8" steel strap were welded to the ring and drilled to clear #10 bolts.

The plate is a 1/2" aluminum plate drilled 2.250" for the adapter and tapped 10-32.  A 9/16" hole for the clamping bolts was added.  To do this over I would have added 1" more distance between the clamping hole and the adapter hole.