Two uneven, rough cut rings stacked for gang sanding to fit.
Right side picture:
A 1/4" diameter dowel was slipped in for strength while sanding the ring sides even
Sand, test fit and sand some more until you get a good friction fit in the BT-20 tube.
The finished mount with a MMX motor slipped inside to check the position of the engine block slid in from the top.
The finished mount will be glued in with the motor extended a little beyond the edge of the BT-20 tube.
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