Cut a slot for the 1/4" wide shock cord attachment.
Apply a glue coat to both sides of the disk and let dry.
The glue coat helps protect the card stock from the ejection charges.
Center and glue the disk to the coupler and let dry.
If you cut the disk out on the pencil line it should be slightly larger than the coupler. Sand the disk until the edges are even with the sides of the coupler.
Test fit the coupler in a scrap piece of BT-60 and sand until you get a slip fit.
Fillet the inside joint of the disk and coupler.
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