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I was bored, got to thinking about adjusting my carburetor and all the “seat the needle and go back 1-1/2 turns” bit, and thought about how to keep track of where the turn is. The screwdriver and pen were both in the cab, so...
Yes, separate design. Then you could sell them as a set. Maybe a combo with metric crescent wrenches.
The chambering fixture I use in my lathe is four sided, with two set screws on each side. Most folks number the sides. I have Ducks & Kitty Cats on mine. Maybe a screwdriver with critters instead of fractions would sell