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					Originally Posted by  layback40
					 
				 
				When ever we have a car off the ground here I get the guy who is going to be under it to grab the side & then the front/back & shake it as hard as he can to see if he can make it fall.  
When you are wrenching hard on a bolt it is easy to move a car sideways & off the stands if its not supported well.  
I once saw a guy trying to undo a bolt on a pitman arm, The car started to topple over, he realized what he was doing & so started to wrench the other way until the car was back level on the stands. He was white & shaking when he got out from under it. 
			
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 I heartily applaud you for that.  I do the same thing... I shake it as hard as I can before I go under it.  
 
Never trust a jack;  use multiple sturdy jackstands;  chock the wheels in both directions;  check the jackstand points to make sure they are solid and not too rusty;  put a spare rim or a solid block under the wheel nearest where you are working.  A couple of inches can save your life.
 
This is a great hobby and it is loads of fun.  I love it.  But I really don't want to post an article like this again, so please, everyone, use your head and be safe.