Grubb Screw on Campag Freehub Body-Why?

shaw8670
shaw8670 Posts: 264
edited March 2014 in Workshop
On freehubs over a certain age (pre 2002ish?) there is a grubb screw on one of the splines. It appears to neither retain the freehub in position or serve any other obvious purpose. Am I missing something by never doing anything with it?
Greetings from the wet and windy North west

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