Guitarist,
Never heard that before - Wiska Box. I've not had much commercial exp. So now I know by the power of Google, I assume the flylead off the armour is connected in with the earth connection from the RFC & the SWA 3rd Core? Sorry for Hi-Jacking, just reading & learning from the odd post.
Yes mate. I use Wiska Earth Clamp Bar for SWA Glands for the armour.