Short overview of adding footman loops to vario cases.
Note that there is a ideal mounting point on the top of the cases. This area is simply a cover and requires no drilling in the inner case.
The footman loop is 1 inch long. This is the length of the inner loop itself. I got mine here:
I used an 8/32 Phillips screw 1/2 long and locknuts and washers.
Open the side case.
Remove the Torx screws holding the top panel of each side.
Remove the locking mechanism by removing the 3 Phillips head screws. 1 short screw is in the middle. If anything the actual yellow locking tab may drop out. Hold it in place.
Remove the 2 additional Torx screws under the locking mechanism.
Eyeball the outside top of the case. You need to ensure the lock nut for your 8/32 Phillips screw is outside of the bevel in the inside of the case.