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The next time you’re in line at Nifty Nut House in downtown Wichita, look up. Above you is an unofficial museum of gum, candy and nut vending machines. Some might call it Steve Jahn’s nutty obsession.

Pushing the two nuts toward each other eliminates backlash between the two nuts and leadscrew. The nut offers adjustable drag torque — it can be very low for light loads or high for heavy loads. The ...