Yeah. To me, it's definitely the scariest job to do. Too easy not to DIY, but....I have an 35 year old clam shell unit that has had about 25 to 30 cars done with it without one spring movement issue. Still going strong. Mine does not have the safety pins in it. The reason I bought it was I had a spring movement issue with one of the one per side version and about crapped my pants. I had a car coming in for a set of struts after that incident and before I could buy the clam shell so I used hose clamps on the springs to at least "try " to hold them in place. I did a bunch of cars before this with the one per side one. All it took was one violent slip to say F this, my safety is too important.