![]() Tour players can indeed have their shafts pure'd. We have no plans to offer PURE'D shafts and do not endorse or recommend the process for Titleist clubs. Therefore, we do not feel PURING adds any performance improvement or benefit. We have never been able to see or measure any performance difference whatsoever. The Titleist Golf Club R&D group has conducted testing with tour and better players to compare performance between shafts that have been PURE'D and shafts that have not. Thanks you guys making me feel sane this morning.,And then there's this: My SLDR set in the same position it's been in for years. I don't even have the tool to do this type of work. I'm not planning to SA anything I'm working on. I think you two guys, Lukes, Meyer you've already confirmed my thoughts. ![]() I'm sure one or more of you guys can set me straight. The spine doesn't change but by inserting the shaft in the head at your prefered setting it's now not aligned. I'm not sure how when spine-aligning a shaft without the head initially attached and in your prefered position/setting (just a bare shaft less adapter - perhaps with a grip) and then attaching the head in some position like we all do that the spine alignment is still aligned. What's the point in Spine-Aligning a driver shaft when it might later be placed in the head at a different position from where the spine was aligned? Doesn't that kind of defeat the purpose of aligning the shaft in the first place? And this applies to any adjustable head club. However, I have been messing around some lately experimenting with a few different shafts for my new Cobra FZ+. I'm not a club builder and not much of a club tinker'er either. The work has not been done to quantify where, between these numbers, is the "threshold" of spine importance, but it makes no sense to talk about aligning spine without also talking about the size of the spine.I need some schooling from you experts out here. It can be measured in CPM or in percentage difference of spring constant, depending on whether your measuring instruments use frequency or deflection.”ġcpm of frequency or 1% of spring constant is a small or even negligible spine. “The size of the spine in a shaft is a measure of the difference between the stiffness at the spine and the stiffness at the NBP. Remarkably little of the discussion of spine alignment addresses the fact that there are big, serious spines and then there are spines that are probably too small to matter. Let's finish with a definition of the size of the spine. The bend of the shaft at rest - with no flex forces on it - is called the "residual bend". Some shafts are straighter than others, just as some shafts are more symmetrical in stiffness than others. Just as it is impossible to manufacture a perfectly symmetrical shaft, it is impossible to manufacture a perfectly straight shaft. But the welding seam isn't the only cause of spine, nor even the major cause. Actually, the name "spine" originally came from the belief that, since most steel shafts were welded tubes, the seam created an asymmetry in stiffness. ![]() It is not some obvious physical characteristic, like welded seam of steel shaft.Having said that, it is important to note what spine is not: But, given imperfect fabrication, the difference will exist. This difference may be too small to be measured or, even if detected, too small to make a practical difference. ![]() Since shafts cannot be built perfectly symmetrically, every shaft will be stiffer (more resistant to bending) in some directions than in others. More appropriate would be something like: “asymmetries in shaft stiffness”, but that’s not quite as catchy and as many people are familiar with the term ‘spine’, I will use it on that basis. More specifically, the spine is the direction of greatest stiffness of the shaft.” “Generically, spine in golf club shafts is the directional variation of stiffness. Let's start by an explicit definition of what spine is. This article can be found in full on his website “What a spine is and what it isn’t. This is a summary from David Tutelman’s article “All About Spines”. ![]()
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