Tip Trimming and Determining Bore Type        
   
 
  Today's tip takes a look at bore types and how to trim shafts accordingly. As you look at a shaft's trimming instructions and see a trim note that references bore type, trimming must be adjusted accordingly to maintain the flex profile of that particular shaft. Remember, if there is no reference to a trim note related to bore type, do not add to the shaft trimming. Here's a look at    
         
 

how to understand shaft trimming and how it is related to bore type:

Initially we must define what is meant by though bore, blind bore, M1 and M2 related to metal wood tip trimming. A through bore (also spelled thru-bore) shaft is one that penetrates through the bottom of the club. You can see the where the shaft exits of the head; or at least ends at the sole of the club. A blind bore is one in which the shaft bottoms out 1/2" from the groundline. An M2 bottoms out at 1"; an M1 bottoms out 1 1/2" from the groundline.

  
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