haha, we used one on my car, but for fun we took one off without one.....launched it at a piece of 2" thick wood..either oak or maple I forget.....put a very nice 1/2" dent in that. .....the impressive part is that the wood was about 20ft from the spring.

just spend the money. you won't regret it! you don't really need it to put the springs back on....but eh, it'll help there too

- Nathan