What effect will the bore through have on the shaft flex?
First, let’s define the term bore through or through bore. This is a particular head design in which the shaft penetrates all the way through the head and sole plate. The shaft is actually visible at the bottom of the head in the form of a black dot. Because Harrison graphite shafts come in combination flexes, the most popular being the R/F – regular/firm and the F/S – firm/strong, it is imperative to tip the shafts correctly. In a standard metal head, to get a R/F shaft to go from regular to firm you simply tip the shaft one inch. The same is true for the F/S flex. However, when installing a R/F flex shaft into a traditional bore through where the depth of insertion is a 21/2″ to 3″, the shaft will move up one entire flex without tipping. Therefore, to get a regular flex using a bore through head you must use an A/R flex shaft and not tip it, and to get a firm flex you must use an R/F flex. If the bore through length is less than 21/2″, as is the case with the Big Bertha or hoselless
