Download for Free the New 2010 Shaft Fitting Addendum

Don’t live in the dark ages anymore, especially with the high cost of shafts today.  Get the information you really need to compare one shaft to another. For 18 consecutive years, the annual Shaft Fitting Addendum has been the number one resource available for clubmakers and ordinary golfers to find invaluable information on golf shafts.  The 2010 Shaft Fitting Addendum has just been updated with over 100 new shaft entries 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 2010 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.

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 a valuable guide.  Consistency has been the key to this text as each of the over 3000 shafts and 50,000 measurements has been conducted by one individual using the same set of procedures and equipment for the past 21 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

To give you a peek of what information is available, look at the chart below. You can compare shafts from the same or even different manufacturers that are of approximately the same overall stiffness and weight.  In this case the Aldila Serrano, Fujikura Fit-On E250, Grafalloy ProLaunch Blue 55, ProLaunch Platinum with Axis Technology, New Image Red Image Graphite and our own True Ace Death Stick are all mid-50g shafts of similar frequencies and stiffness index.  But find out what the differences are.

How Do I Use the Information?

While offering all of this data is great, being able to take this information, understand what all the numbers represent and then be able apply it into your everyday fitting is another.  This is why we established the Dynamic Shaft Fitting Index (or DSFI for short).  The DSFI takes the Completed Club Frequency, Butt Deflection, Tip Deflection, Cut Shaft Torque and Club Length and puts it into a complex algorithm to put a number on stiffness.  No longer do you need to rely solely on the generic flex designations by the manufacturers.

In Chapter 5, the addendum explains why you may want to select the Aldila Serrano over the Grafalloy ProLaunch Platinum or visa versa. You can also relate Dynamic Shaft Fitting Index to the clubhead speed or the golfer’s driver or 5-iron and be able to make appropriate shaft selections. However, swing speed is only a starting point – certain golfers will use different flexes based on their tempo and length of their swing rather just swing speed.  The 2010 Shaft Fitting Addendum can help you understand these issues.

The 187 page Shaft Fitting Addendum is broken down into 5 chapters, but you don’t have to download everything.  The first shaft 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 2010 Shaft Fitting Addendum with Chapter 2 showing the data and Chapter 5 providing the how to use the information with the master 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. 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.

So don’t be like a member of Congress and do absolutely nothing, download the 2010 Shaft Fitting Addendum today.

Download Chapter 1
Download Chapter 2
Download Chapter 3
Download Chapter 4
Download Chapter 5


  1. Lou says:

    Which chapter will answer the question on shaft spline marking. When you get a shaft splined there is a line on the but end. Which you use to assemble the club with the shaft line at 12:00 why not at 3:00. I have always used 12:00 but someone asked me why the shaft is splined in a horz. plane and marked in vert. plane?

  2. Jeff Summitt says:


    None of the chapters will address that as that is assembly issue. The mark you see on the butt end is often a grease pencil mark to indicate the plane of the unpainted shaft when it was checked for flex. Unless you have a frequency analyzer to measure the shaft, you will not know how stiff (or weak) the 12-6 plane is or the 3-9 plane is to see if there is a difference.

  3. Justin Blair says:

    Any chance we could see some newer models in the 2011 offering? I like how comprehensive the list is, but it’d be nice to see how these new “it” models really stack up to what’s already been tested. Thanks for everything you and your staff do!

  4. Jeff Summitt says:


    It is on the list of things to do. Hopefully in March it will up.

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