A side question... Why does 'Clubshaft' and 'Club Shaft' appear in the text in those variations? I know the the use of capitalization, etc has significance, does combining them have any significance?
The non-uniform terms Club Shaft and Clubshaft have identical meanings. Hence, give no special significance to the use of one versus the other. Similarly, consider interchangeable the terms Sweet Spot and Sweetspot.
Personally, I prefer the term Clubshaft because of its consistency with the terms Clubhead and Clubface.