Estes Star Speeder #1366 Build, Part 2, Cutting Centering Rings

These centering rings fit a BT-20 tube into a short length of BT-55.

Draw a vertical center line before tracing around the two tubes.

Use a new sharp blade and only cut the inside circle for now.
Because you traced around a BT-20 tube, the outside diameter line is wider than the whole you need to cut. Cut just inside the pencil line.
You've read this before - Don't try to cut through with one pass. Use lighter pressure for more control and a smoother arc of the cut.

There will probably be a rough cut edge.

I wrapped some 220 grit around a used engine casing to smooth out the center hole.

Sand a bit and check the fit.

The BT-20 main body tube has a good friction fit in the centering ring.