Mike,
Not sure what a pistol cable lock looks like. Go ahead and bring it to the next meeting and we can try it out. If you look at the second picture I took from straight on, you can see the hole I'm talking about in the triangular piece of the mount that holds the jack out away from the roof rack.
Also, you have email. I'm in the market for new tires for my other car, and had a few questions for you