Cleanflight Blackbox case

I wanted to protect the sdcard Blackbox board from crashes using Filaflex (elastic case)
I choosed to attach it to a spacer. The model il a zmr250 or a Emax Nighthawk.
I have to find an easy way to access to the sdcard. I saw that Cleanflight include a tethered function to access to sd card.... Maybe it's the solution.

Blackbox board goes from multirotormania.

I adjust the hole to fit better to the spacer.