Old Centuri Shock Cord Mount

Here's another way to do a shock cord mount, this time from the old Centuri SR-71 Blackbird kit.

The "two identical shock cord fasteners" could easily be cut from 110 lb. cardstock.

On the JimZ site, the fastener looks to be 1/2" X 1".
I would probably make it a little larger.

This type of mount could be used on body tubes sized BT-55 or larger, maybe down to a BT-50.
This design is a bit flatter than the Estes Tri-Fold style mount.