Bucky CC - Thanks for your question.
Within any manufacturing there are tolerances and we work HARD to eliminate any production tolerances through the tight specifications we require of our supply partners to our multiple production specification checks. Additionally, our production and shaft rolling processes were designed to eliminate variances. With graphite, we are able to place materials (lighter/heavier, softer/stiffer) exactly where we need them to create specific performance attributes - this is our advantage. Meaning, we not only have the ability to use a variety of types of carbon fiber, but we also can apply and wrap these materials with exacting precision to ensure concentricity, eliminating any performance/quality issues during the production process. All of this being said, all products have tolerances, no matter what you purchase. If you feel PUREing will provide you confidence in your purchase, by all means go for it, but we believe and stand by our production processes and multiple specification checks that ensure the performance of our designs.
For more on this, check out - https://mygolfspy.com/shaft-u-production-process-101/
Hope this helps!
-AT