Kellogg Writes:
Most cases a tool is more pleasant to use if there is a shallow
depression to help locate the user’s finger. Consider, for example, a
rotary knob a couple of inches in diameter that the user spins, such as a
radio tuning dial. Another example might be a lever the user depresses
with his finger. Or a finger dimple on the end of a food processor lever.
When
adding some comfort to your shop made tools, a 135° split point drill
makes a nice dimple for your finger. I use a 1/2" drill and drill down
until the outer lips are at the surface level of the part. After
polishing with emery, it adds a nice touch of class to the tool.
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