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diffhistHelix 14:03−8
Just plain Billtalkcontribs (→top: Conical coil springs exist, but no matter. "cylindrical screw" is stilted and opaque. The business end of a regular corkscrew is a familiar example.)
diffhistHelix 03:09−9
Kent Dominictalkcontribs (All coil springs are cylindrical; "screw thread" complicates the issue since not all are helical. I don't really see a problem with reverting to "spiral of a corkscrew," which is the industry term (aka "worm") for the relevant corkscrew part that is neither a prong nor a bolt.)