Here's the extended circle marks, all are 6" from the center of the middle dot.
Cut out the circle. It's easiest to trace around the circle with a sharp knife.
To mark the sheet for six shroud lines -
Fold the circle in half.
Fold the outsides in into even thirds. Lightly mark the folds with a Sharpie.
I cut three 26" lengths of #10 cotton embroidery thread.
Cutting 26" long lines allows 1" on either side for the loop and knots.
Here's the finished chute, ready to be tied onto the shock cord.