The user puts a pencil with an eraser end in each hand between index and middle finger. He reverses the pencil to use the eraser end on the keys. To avoid the pencil slipping between the fingers a rubber band is wrapped around the opposite end of each pencil. The rubber band is positioned under the bend knuckles.
With this simple device the user has become fast on the keybord.
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Se also spinalistips.se/en/tip-typing-on-computer
This tip is from 2010