I sure the small rings are available somewhere, I didn't have them. Why wait for an order. I'm cheap so I'll make a few.
A 1/4" punch was used to start the inside ring hole.
The hole was widened using a knife spin followed by a half round diamond file.
The fit was checked with the yellow engine tube I had.
Center the BT-20 tube over the cut just made and trace with a sharp pencil point.
Final fitting in the next post -
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