Author Henry B. Fried, in his Introduction to Watch Crown Manual stresses the importance of a watch crown in a repair:

Many of us who are intimately concerned with the proper functioning of watches, often lose sight of the importance of the watch crown. Too often the choice of a crown is just an incidental, or an after-thought; yet to the wearer of a wristwatch, the crown can be an Achilles heel . . . the point at which the manufacturers, or the wratchmakers reputation is most vulnerable.

The wearer may not consciously ask himself questions, Does the crown match the style of the case? . . . Is it the right color? . . . Does it wind easily? . . . Can I grasp it easily to move it to the setting position? Nevertheless, if the answer to any of those questions is No, then a seed of dissatisfaction takes root and grows in the mind of the wearer every time he touches the crown, that is, at least once every day.

In this handy guide, Fried discusses, When to Replace a Crown, Selecting the Right Crown, Matching the Color Properly, Stem and Crown Threads, Fitting the Crown to the Stem, Work with Waterproof Crowns, Watch Crown Styles, Crown Nomenclature, and Crown Dimensions.

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