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by homarp 3009 days ago
it is in "50 Secrets of Magic Craftsmanship" a bit after the "Three rules for controlling your dreams".

Edit: Search for the sentence "In this posture, you must hold a heavy key which you will keep suspended, delicately pressed between the extremities of the thumb and forefinger of your left hand." and look at the google book result, you can read the page 36.