Full details of the procedure for measuring club face markings and determining their status against the 2010 specifications can be found on The R&A’s website. However, a summary is as follows: The ...
If the average width of the measured groove widths exceed 0.035” (0.889 mm) then the club is non-conforming. If any single measured groove width exceeds 0.039” (1.0 mm) then the club is non-conforming ...
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