I want to create a model of car but I can not constrain the suspension.I use the button spring, but how?

I should buy it so you tell me how? a small guide.
if it is as simple method, I decide to buy it.
thanks

Good morning everyone.
there is a way to export the animation made with sketchyphysics? I tried with the plugin camera recorder, but does not work ..
thanks

I just wanted to know if this plugin could give the drawings a bit like working with StruCad

Hello everyone,
what do I need this plugin for SketchUp?
I design and then he pulls out the construction drawings?? I did not understand...

this is the site
http://www.northernlightstimberframing.com/su/