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Doorknob Lever Adapter Clamp
A split-band clamp that grips a standard round door knob (50–56 mm, eleven internal 1.25 mm grip ribs) and adds a 95 mm lever arm so the door opens with a forearm, elbow or closed fist instead of a twisting grip. One M4 bolt through the 4.5 mm clearance ears pulls the 4 mm split shut onto a captured M4 nut; band is 22 mm tall, arm 14 mm thick, overall 139 x 63 mm, and it prints flat with the lever load in the XY plane.
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