My personal opinion is that I wouldn't have thought so, bearing in mind the fact that it starts to wear and stretch as soon as you start the engine so its not going to keep a precise setting for long.
If you usually change the belt yourself you will be familier with how tight it needs to be, but I say again that is only my personal opinion. I would like to know why they specify this method, maybe its just due to the incompetance of some mechanics.
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