I went to payloadbay.com and printed two shrouds in the "Tools" section. Punch in the outside diameters for a BT-20 and BT-55 x 1.3" tall.Look close and you can see two shrouds, one stuck inside the other. There is an overhang at the bottom.
Why a double layer shroud? It's just stronger! These work especially well for exposed nozzles on the low end. Imagine a thin card stock nozzle getting bent up after hitting the ground first.
For more detailed instructions: CLICK HERE
A glue stick works a bit better over wet glues. When the shrouds are glued together, set the seams on opposite sides.
After it dries, the overhang is trimmed off with a single edge razor blade. The wide trimmed edge is sanded flat on a block.
On the left, notice the stepped inside edge. These two edges are the same diameter, fit the BT-20 making two ring contact points.
A notch is cut in the 20/55 centering ring for a engine hook.
When gluing in the ring, the notch is lined up with the seam on the outside of the shroud.
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