【Shell Lock】fla1021 's Japan Review

This will also allow non-molded flights to be spread at a solid 90 degrees, and flights that are prone to wear and tear can be made closer to molded flights at a lower cost.

Developed to be attached to regular folding flights...
and cannot be used on L flights that support champagne rings (tested).
Please be careful when purchasing.

It has grooves in four directions and opens to about 90 degrees.
If you also use the flight protector, it will open to almost 90 degrees.