This article is from the Locksmithing FAQ, by Joe "Spike" Ilacqua spike@indra.com and Henry Schaffer hes@ncsu.edu, major data collection effort by Scott Anguish sanguish@digifix.com with numerous contributions by others.
Hobbit has written an excellent discussion on workings of
Simplex locks. Hobbit left FTP Software and his FTP archive is
currently unavailable. However we have a copy available.
 
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