The short answer
Test iron shafts for repeatable contact and usable flight, then confirm the set can be built to suitable lengths, lies and swing weights.
An iron-shaft fit has to become a coherent set, not merely produce one impressive shot with a test 7-iron. Weight, profile and build should support predictable contact and flight across normal swings.
Find a sustainable weight
Compare the same head with shafts that let you sense the club without forcing tempo. Include enough repetitions to notice fatigue. The best result late in the test can be more revealing than the fastest early swing.
Check trajectory and stopping flight
Judge strike location, launch, curvature and carry spread. A flatter flight may look controlled but still be unsuitable if it cannot hold the intended green; extra height is only useful when distance and direction remain predictable.
Translate one club into a set
Confirm tip type, available discrete lengths, finished lengths, swing weights and lie angles. Ask how long irons and wedges will progress from the test club rather than assuming one build number applies everywhere.
Check more than the middle iron
After finding a promising test build, discuss a long iron and a scoring iron. A shaft that produces a useful 7-iron flight may feel demanding in the longest iron or too light in a wedge-length build. Set makeup may call for a hybrid transition rather than forcing the same shaft through every slot.
Understand .355 and .370
A .355 taper-tip shaft and .370 parallel-tip shaft require compatible hosels and different build planning. The numbers describe nominal tip diameter, not quality or flex. Do not modify either component to force a fit; have the head and shaft identified first. Continue with the LA Golf iron guide or wedge progression guide.
Include lie as a separate build check
Shaft choice can alter delivery and strike, after which lie may need assessment in the finished-length club. Do not use lie-board evidence or face marks as a stand-alone verdict; relate them to starting direction, impact and the player’s setup.
Plan the set build
Fix It Golf provides iron fitting, reshafting and loft-and-lie adjustment. Review club repair and reshafting services or discuss a fitting with the head model and current set makeup.
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