The 2012 Shaft Fitting Addendum is Now Available

Don’t live in the Stone Age anymore, especially with the high cost of shafts today. Get the information you really need to compare one shaft to another. For 20 consecutive years, the annual Shaft Fitting Addendum has been the number one resource available for clubmakers and ordinary golfers to find invaluable information about golf shafts. The 2012 Shaft Fitting Addendum has just been updated with many of the shafts available to you today.

If you are looking to advance your knowledge on the ever-confusing world of shafts, take this opportunity to download the 2012 Shaft Fitting Addendum. This is a companion piece to one of the best books written about shafts called the Modern Guide to Shaft Fitting. And the best part is both of these books are available for free. This is just another example of how Hireko is helping out clubmakers, club fitters and fellow golfers alike by providing you with such indispensable information so you can make more well-informed choices when it comes to purchasing new equipment.

How Do I Use the DSFI Information?
If you have seen some of our cheesy videos, you might have noticed I don’t exactly have a stellar swing. But how many of us really do? Shaft fitting has nothing to do with age, handicap, sex or religion. In fact, it only has to deal with strength, tempo, length of swing and personal preferences such as weight and feel (a factor of stiffness distribution and torque). That is why the DSFI (Dynamic Shaft Fitting Index) works to help identify shafts that a player can use. The DSFI starts with clubhead speed or the golfer’s driver or 5-iron distance and be able to make appropriate shaft selections.

For instance my swing speed hovers in the 95 mph range as Father Time has decreased that of late. I would describe my swing as a moderate tempo which is gradual buildup of speed at the top of the swing, accelerate, release the club early and decelerate prior to impact. Using our DSFI system that would mean I should look for shafts with a DSFI rating between 92 and 97% of my swing speed (87-92). Don’t worry we do the math for you.

Guess what, when I look at all the shafts that I hit well they pretty much fall in that narrow range. Some of which are R flex and others S flex. That was one of the reasons for the testing I have done for the past 23 years is to help somewhat putting a number on stiffness in a world where shaft standards don’t exist.

What Type of Information Will You Find?
For those that are not already familiar with the Shaft Fitting Addendum, the first thing you will find out is not all R-flex shafts are created equal – that is in terms of flex, torque, bend point, etc. as every manufacturer are their own standard. In reality, there are no industry standards for shafts and the reason why this book serves as an invaluable guide. Consistency has been the key to this text as each of the well over 3000 shafts and 50,000 measurements has been conducted by one individual (yep, that’s me) using the same set of procedures and equipment for the past 23 years.

There are 19 published specifications listed for each shaft that include:
Flex, Uncut Shaft Weight, Tip Diameter, Butt Diameter, Uncut Shaft Balance Point, Cut Shaft Balance Point, Completed Club Balance Point, Total Assembled Club Weight, Head Weight, Grip Weight, Cut Shaft Weight, Completed Club Frequency, Butt Deflection, Tip Deflection, T/B Ratio, Cut Shaft Torque, Raw Shaft Torque, Club Length (and wood bore type) and DSFI (Dynamic Shaft Fitting Index) Rating
Some of the specifications may not be important to you or only help you with assembly such as knowing how much head weight you can expect at a specific length. In other cases, there are several key parameters as shown in the following table which can be considered the shaft’s DNA.

Common Denominators
This is just a sampling of shafts in the Shaft Fitting Addendum which happen to be shafts that I have currently in my stable of drivers. I have experimented putting shafts in that were from L flex to double XX, super light shaft to much heavier ones, low torque to high all to see how they perform to my swing. These widely varied shafts just happen to be ones I found by trial and error that found their way into my bag.

As you can see there are some common denominators, most notably butt and tip deflection in my case.  If you scour the driver chart in Chapter 5 in the Shaft Fitting Addendum, you will find there are many other shafts with similar DSFI ratings. Some of which that have much different DNA, but others that do that could be potential candidates for me to try.  In the same token, you can look at the shaft DNA of those shafts you didn’t care for and remember to avoid using shafts that had very similar test results.

The 192 page 2012 Shaft Fitting Addendum is broken down into 5 chapters, but you don’t have to download everything.  The first chapter provides the legends of what each of the specifications are and we would encourage you to read that carefully.  Chapters 2 and 5 are the nuts and bolts of the 2012 Shaft Fitting Addendum with Chapter 2 showing the data and Chapter 5 providing the how to use the information with the master shaft fitting charts in order of stiffness.

In addition, club fitters or even ordinary golfers can look for suitable replacement shafts that may not exist anymore by looking through the archived shafts (Chapters 3 and 4). These are all the shafts tested that are no longer available but may contain information on shafts you have hit well in the past. As I mentioned previously, matching shafts of similar cut weight, frequency, cut torque and tip and butt deflections will help you find that one shaft you owned previously that they liked so dearly.

Become more educated on golf shafts and Download the 2012 Shaft Fitting Addendum today.


  1. charles graham says:

    As a new builder, I am still trying to find the EASY way to fit an build clubs. I still don’d understand most of the terminology. I have the complete book on clubmaking bought off the internet. But I still don’t understand a lot of the terms. Hopefully this will help me a lot. Thanks

  2. Ray Richards says:


    The link is gone.

    Can I get the Addendum somewhere else?


    Ray Richards

  3. Jeff Summitt says:


    Thanks for pointing out the broken links. I believe they are all fixed, but here is the new link:

  4. […] testing shafts in 1989 to more accurately compare one from to another. In 1991, I created the DSFI (Dynacraft Shaft Fitting Index) formula as a way to accurately compare shaft stiffness based on the interrelation between golf club […]

  5. Bob H says:

    Your 2012 addendum of shaft data has been a great help to me in selecting the appropriate shaft. Recently, I have been looking at the UST-Mamiya 65 gold. There is a discrepancy in the torque values in the 2012 addendum and your 2013 catalog. The raw torque numbers for the 65 gold “S” shaft are 5.55 and 3.9, respectfully. Has there been some change in the construction of that shaft to lower the torque? which is correct. Thanks, great website. Regards, Bob H

  6. Jeff Summitt says:


    The Shaft Fitting Addendum of the specs you see in our catalog are two entirely different things. The catalog shows what the manufacturers’ publish, while the Shaft Fitting Addendum is what we measure using our own testing methods – but the same for each shaft tested so we can compare apples to apples. We will almost always measure a higher torque value than the brand name manufacturers since we clamp a longer span of the shaft. Rest assured, it is the same shaft with no changes, just different methods of measuring.

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