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Density Port Lab Interior Weight Port Fitting
Shaft Guide

Picking a Shaft After the Ports Are Already Set

Shaft selection at most shops happens first, before anyone has touched the head's internal weighting. We do it in the opposite order — lock the port arrangement, then pick a shaft that matches the balance point it created.

Flex Letters

A Guideline That Shifts With Port Weight

Flex letters — L, A, R, S, X — describe how much a shaft bows and releases through the downswing relative to swing speed and tempo. What most golfers don't realize is that moving grams between ports changes total head mass, which changes how a given shaft actually loads, even if the flex label on the shaft itself never changes.

That's why we finalize port weight before shaft selection rather than after — picking a shaft against a head mass that's about to change wastes the fitting.

L / A Flexunder 80 mph
R Flex80–92 mph
S Flex93–103 mph
X Flex104+ mph
Shaft Material

Three Construction Types, Three Trade-Offs

Steel

Runs heavier and holds tighter tolerances between individual shafts, which pairs well with a head that's already carrying extra mass in the rear ports.

Graphite

Trims mass to add clubhead speed, which can offset a heavier total port weight for players who moved grams toward the back for launch without wanting to lose speed.

Composite Blend

A graphite body with a steel tip section, useful when port weight has already pushed swingweight higher than you want and shaft mass needs to come down to compensate.

Total Mass, Not Just Flex

Port Weight and Shaft Weight Are the Same Budget

Every gram moved into a port is a gram that isn't available for shaft or grip weight before swingweight climbs past a comfortable range. Treating the two as separate decisions is how players end up with a head that's technically well-mapped but a total club that swings too heavy or too light to control.

We total port mass, shaft weight, and grip weight together before finalizing either variable, so the finished club balances as one system instead of three separate guesses.

Total Mass Budget
Port Massgrams
Shaft Weightgrams
Grip Weightgrams
Target Swingweightletter/points

Match Ports and Shaft in the Same Sitting

We finalize port weight and shaft selection together, using your own recorded numbers from the bay.