1. Robert Sasser says:

    What does it mean for bore type? I ordered Apollo Shawdow FL (55g)wood shafts. I ordered the Dynacraft Evolution 12Degree bore type M1. For a R-flex 0″ tip trimming, but with the M1 bore it says to add 1 1/2″ tip trimming. So for the flex that I want will I have to cut 1 1/2″ from the tip because of the M1 bore?

  2. Jeff Summitt says:


    Here is an article to show what the bottom of bore to ground line means:

    However, for the Apollo Shadow FL, you don’t have to add to the tip trimming for bore type. That trimming note (A) only applies to a handful of shafts. It will be a part of of the trim code. For example, if it says Trim Code W4 A, then you would add to the tip trimming. But for Trim Code W4 you do not.

  3. Bob says:

    Can you please tell me the tip diameter of the shaft required in the assembly of Hindsight putter? It appears to have a .313 diameter tip.



  4. Jeff Summitt says:


    The Hindsight putter has a post that fits the inside diameter of a 0.370″ parallel tip steel putter shaft.

  5. Phil says:

    If you use a light shaft in your irons seems to me the swing weight will go up , then you use a shaft weight to bring it back to what you want does this not defeat the purpose of the light shaft in the first place. ????? Or are their other benefits i’am missing , or does the swing weight really go up?????

  6. Jeff Summitt says:


    Swingweight is the relationship between overall weight and balance point referenced from a fulcrum point 14″ from the butt end of the club. Since the majority of the shaft lies past the fulcrum point, lighter shafts will often yield a lower swingweight. Instead of making the club longer (although a possibility to increase swingweight), the head weight is increased (not shaft weight).

  7. Cliff says:

    Making a counter weighted Pustter (Technical article) Can you use lead tape under the grip tape or in my case using masking tape which allows me to use compressed air to install my Grips. Learned this about 20 Yrs ago.
    I have some 3/4 in lead tape. I am going to us the Red winn grip suggested in your tech article. Would this still be trial & error to find the right feel. I also have an aculite malet putter head which has a white circle in the middle of the head. I wondered what its head weight might be if you still have records on these heads 3-5 yrs ago I ordered it. Thanks

  8. Jeff Summitt says:


    You would have to use a LOT of lead tape to be effective, plus it will add to the diameter of the shaft. That’s why the Tour Lock Pro counterweights are so easy to use. Re-check the putter head for the name. We have used Acculite name for some of the Apollo shafts but not on any heads.

  9. Tony says:

    I have been trying different shafts but to no avail. I have lost a lot of my swing, so my distance is a lot shorter, went with graphite, but not to much sucess. tried different things. see if you have any ideas. If I soften the flex then control problems arise. Thank you, Tony.

  10. Jeff Summitt says:


    Just because your speed has been reduced doesn’t automatically mean that you should drop a flex or reduce weight. For example, if you have a short, compact swing or quick tempo, you might need a shaft that is stiffer and even possibly heavy to help you gain accuracy. A shorter swing may not have enough time for a more flexible shaft to recover and square up at impact as a stiffer one will.

  11. Bernie Baymiller says:

    Nice article on effects of CG locations. But you didn’t mention that the distance of CG from face also determines amount of horizontal face curvature required to offset gear effect inaccuracy from ball impact off center on a wood face. When my father was Director of Golf Research at AG Spalding in the late 1930s, he researched and received a patent on the method to determine the amount of curvature necessary on a wood club. I’ve found it very important to have the correct amount of face curvature on today’s big heads and longer clubs. If you would like a copy of his patent, I can e-mail one to you as an attachment. It makes interesting reading. The lab’s Wagglemeter patent for MOI shaft matching is also interesting…far preceeding other firms claims of frequency matching and today’s “computerized” MOI shaft matching technology.

  12. Jeff Summitt says:

    Hi Bernie,

    While i didn’t mention it in this article, I do in our newest club fitting book which is slated to hit the shelves next week. In there I do credit your Dad and Robert Vose for that finding.

  13. Harry Tanaka says:

    Can you refer me to an article or information regarding comparative differences between hybrids and irons for lofts and club lengths. I reckon there are often different standards used by different manufacturers, but I just want an idea, since I notice some hybrids tend to be longer with more loft than others for the same club number (e.g., 4 or 5). Thank you.

  14. Jeff Summitt says:


    Here are a couple of links:

    For the life of me, I cannot find the one I wanted that talks about assembly length.

  15. Kirk Bloedorn says:

    I have an Adams #7 hybrid. I purchased a UST Mamiya hybrid shaft in a L flex. Tip trimming instructions stop at 2″ for #5 hybrid. AM I safe to to tip trim another inch for the #7 hybrid since the increases from ) to #5 are in 1/2 inch or do I just leave it at the #5 trimming?

  16. Jeff Summitt says:


    There is 4.75″ of parallel tip section giving you a little more room to tip trim to offset for the heavier head. If you leave the trimming at the #5, then the shaft will become a little bit more flexible. The other option would be to use the matching iRN shaft and cut the shaft according to the weight of the head relative to a standard iron.

  17. Kirk Bloedorn says:

    Thank you Jeff.

  18. Stephen Goss says:

    My favorite driver shaft used to be a True Temper EI-70 Tour Stiff. What on the current marketlose to this shaft???

    Also, the best fit I ever had in an iron shaft was the old Wilson Firestick 2.8 Stiff shafts that I had in a set of Wilson Staff Mid-sized Irons – shaft was red back then……before they started sticking that name on cheaper store-line models. What come close to that shaft on today’s market???
    Thank you.

  19. Jeff Summitt says:


    For the EI-70 Tour S you might have to look at an Aldila NV 75 X-flex as a modern equivalent. The Firestick 2.8 was made initially by Aldila and a 90+ gram shaft that ran pretty stiff. I might suggest the Aldila VS Proto 100 if you wanted to stay in the Aldila line or the SK Fiber Tour Trac 95.

  20. ed says:

    What stell shaft is comparable to the TT Speed Step 80 used in Callaway XR and Big Berth

  21. Jeff Summitt says:


    I might suggest the Apollo Acculite 85 steel.

  22. Al Melini says:

    One of the most difficult concepts to pass along to a costumer is that there is no industry stanard with regard to shaft flex!!
    The old truer temper. TT lite shafts were very much stiffer in the A And L flex than some shafts in R and S flexes for other shaft companies!!

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