Gas cap Lock?

Well, as much as I appreciate the advice, I violent route isn't the answer. I appreciate the thought, and there are some things I am thinking of involving the PD. But either way I have no other place to keep the car except on the street, and I have seen 2 other a bodies in the area missing gas caps. So even if I can stop this one jerk, I don't trust all the others. Either way I would like a locking cap if its doable. That Stant G-757 looks close, but I am not positive. Does anyone have experience with it?