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There is no answer to your question. (I dont think). Every machine is set up differently. most people see if it is running sweet, by ear. have you got the manual? I think it mensions it in their doesnt it.
Also, there are loads of clips on youtube showing you the basics.
I was told to go for what sounds right, I have also been told that you put your thumb nail on the grommet or top hat and if it hurts its too high. But not sure about that one...
