Depending on what you need to work on? they will work fine under the lower control arms, when the weight comes down the suspension will settle and they will be firm. body pinch welds, at rear on suspension arms or body pinch welds, get the weight on the stands and give a little shake just to make sure it has settled, work on firm flat concrete floor as well, if in doubt get someone with more experience to check first hand as to the positioning of the stands.
Heres a guide on that subject, it will help
And a video
Saturday, November 26th, 2011 AT 1:11 AM