Both CD3 units are visible here mounted in both recessed and surface methods. Avionics bay is designed for dual recovery in 4" graphite rocket. Large hole is for both access to power switch and for barometric port.

Here is a recessed mount, 24 gram CD3 using turned aluminum bulkplates on a Hawk Mountain 4" coupler. For use in dual deployment rocket. Locking toggle switch is for powering dual G-Wiz flight computers. Nomex sheath eliminated for picture.