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- 13:38, 15 February 2025 Lpuinfo-admin talk contribs created page Challenge Lock (Created page with "A "'''Challenge Lock'''" is defined as: A commercially made lock '''and working key''' that includes '''a minimum of SIX modifications by the lock builder'''. Number of modifications must '''total or exceed SIX''' and may include any or all of the following: * Turned, sculpted or shaped key pins * Turned, sculpted or shaped driver pins * Modification to the chambers by threading or counter-milling * Improvised secondary locking mechanism * Distinguishing mark engraved...")
