The worst one GM had was on the 63 (maybe other years also) Impala ignition switch. All that was required was to buy one, complete with keys, find an unlocked 63 Impala, reach under the dash and unplug the wiring harness. Plug in your switch and off you go. No tools required.Anybody remember the ‘80s GM vehicles with the key cylinder on the front fender? Used the same key as the door locks and it was GMs answer vehicle security. I mostly remember them on the Caddys, particularly the Eldorado & Seville. My Toronado had one, but it was next to the filler neck behind the rear license plate