[Knufferlbert]

That is a very weird take to me. That big slam presumably is the spring breaking, a lot of energy released at once in a rather uncontrolled fashion. The same energy will be released if you make a mistake installing it or the spring is faulty for whatever reason while you are standing right next to it.

My take away is that it's to dangerous to do.

[tmaly]

If you take the weight off the spring so it is limp, and you secure the door, this removes the danger.