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Note: How to identify gear sets by their markings using 23:28 set as an example:
23 28 No other markings Hewland gear of early lineage. Material English versions of 8620 or 9310 if late. However no marking identifiers.23W28 Webster Gearset, prior to 1986 material 862023W28 with date (11/87 example) Webster gearset post 1986, 8620 material.23W28S with date 1991 or later Webster “s” gearset, upgraded machining, hobbing and grinding facilities introduced. Material 8620.23M28 (also dated 1993 or later) Webster “s” gearset with material change to 9310.23 28 M Hewland gearset late tooth design, English version of 9310 steel.23 28 N Hewland gearset with latest tooth design, English version of 9310 steel.Current generation Hewland Gear Sets have their logo and ratio lasered on the gear face.Gear sets are a ‘matched set’ – Never mix same tooth count with another set
