A few years ago, I was working in the shop alone, as usual. I had just let a car down of the lift and was going to get in the drivers door to start it before I moved the arms under it. So, mistakenly I stepped on one of the arms to aid in getting in. MISTAKE.. The arm swiveled under the car and threw me backwards into the adjacent wall. Hit the back of my head so hard that I must have gone out for a few moments. When I came too, I realized what had happened. I was dizzy for hours after that. Scared me pretty good, since I knew I was alone. Now, I NEVER use the arms as an aid to get into a vehicle. Lesson Learned. :rofl: