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The Secret Lock

Answer :

This puzzle entailed the finding of an English word of three letters, each letter being found on a different dial. 
Now, there is no English word composed of consonants alone, and the only vowel appearing anywhere on the dials is Y. 

No English word begins with Y and has the two other letters consonants, and all the words of three letters ending in Y (with two consonants) either begin with an S or have H, L, or R as their second letter. 

But these four consonants do not appear. 

Therefore Y must occur in the middle, and the only word that I can find is "PYX," and there can be little doubt that this was the word. 

At any rate, it solves our puzzle.

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