Tag Archives: Iron Shaft Reviews

autoFlex Joy365 Golf Shaft Review

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Korean Hidden Technology autoFlex Joy365 Driver, Fairway & Hybrid Shafts

By Russ Ryden, Fit2Score, A Dallas Fort Worth Club Fitter & Builder
The Highlands Performance Golf Center, Carrollton Texas 
Golf Digest Certified America’s 100 Best Club Fitter

Korean Hidden Technology AutoFlex Driver shafts came to the US market several years ago. I saw one in 2021. They caused a sensation with a $790 price point. They were very light weight and started a trend for light weight driver shafts. Ultimately the recreational US golfer was not ready for light weight shafts at that price point.
I met with Korean Hidden Technology at the PGA 2025 merchandise show and shot an interview in their booth. It is on the list of videos that need to be published. They followed up with a shipment of review samples of every SKU they make. I don’t see much difference between the Joy365 and the original autoFlex shafts. The autoFlex website tells us the Joy is made with updated prepreg. the measured differences are subtle. Without hitting them I cannot comment on feel.

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Russ

UST Mamiya Recoil Dart ESX Iron Shaft Review

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UST Mamiya Recoil Dart ESX Iron Shaft Review

By Russ Ryden, Fit2Score, A Dallas Fort Worth Club Fitter & Builder
The Highlands Performance Golf Center, Carrollton Texas 
Golf Digest Certified America’s 100 Best Club Fitter

The UST Mamiya Recoil Dart ESX is my first iron shaft review in 2025. Review samples came from a major brand that offers them as a small upcharge. An option well worth the investment if you are considering carbon fiber shafts in your irons. It has been a long time since I looked at UST Recoils. I had a relationship with UST when they introduced the idea that hoop deformation added to club head speed. Unfortunately at about that time I began documenting hoop deformation and could not see much difference between the recoil and other carbon fiber shafts. And certainly not any similarity to steel shafts. That is no longer the case. As you will see below, the hoop deformation profile of the recoil is unique.

To continue reading this section of the review, you must be registered at a higher level membership.
Russ