gems not a man to make gentle love to a box!!!
he likes to give it rough to a box!!!
he likes it to wine and once it does he give it his all!!! then bang!! end of story!!
Another reason is if you've a welded diff or 2way and you get a brake test on the rollers with just say no l/h brake, a welder will give the impression of a brake even tho there's none, but the tester should notice it when movin the car!