left-hand screw

left-hand screw

[′left ¦hand ′skrü]
(design engineering)
A screw that advances when turned counterclockwise.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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'Chirality is observer-independent; no matter how one looks at a right-hand screw thread, it remains different from a left-hand screw thread.
Remember, do not touch the left-hand screws or you will lose your adjustment on the first scope.