Underlisting Layers and Swingweight Creep

Building a grip up to the correct core diameter usually means adding one or more layers of double-sided tape — commonly called underlisting or build-up tape — underneath the grip itself. It's a routine part of matching grip size to hand size, but each layer adds a small amount of weight at the very top of the club, and that weight has an outsized effect on swingweight.

Why Position Matters More Than Mass

Swingweight is a measure of how a club's weight is distributed relative to a fixed fulcrum point, not simply its total weight. A gram added at the grip end moves the balance point toward the hands and lowers swingweight; the same gram added at the head does the opposite. Underlisting sits about as far from the head as weight can get, so its effect on swingweight is proportionally larger than its actual mass would suggest.

A Rough Rule of Thumb

Each additional wrap of standard build-up tape typically shifts swingweight by roughly one to two points, depending on tape weight and club length. That's enough to notice in feel even though it rarely shows up as a complaint golfers can name — a club can start to feel "head heavy" or "whippy" after a regrip with extra wraps, without an obvious explanation.

The grip changed the size of your hand's problem. The tape underneath it quietly changed the swingweight problem instead.

What Happens Across a Full Set

The issue compounds when different clubs in a set end up with different wrap counts — maybe two irons were reground with an extra wrap during a past repair while the rest of the set has one. Swingweight then drifts unevenly across clubs that should feel identical, which undermines gapping consistency even if lie, loft, and length are all still correct.

How We Handle It on the Bench

Every regrip gets logged with its exact wrap count, and swingweight is re-checked after the new grip goes on, not assumed from the spec sheet. If a client needs extra buildup for hand comfort, we adjust head weight or shaft selection elsewhere in the build to bring swingweight back to the target rather than letting it drift.

The Takeaway

Build-up tape is a legitimate, necessary tool for correct grip sizing — but it's not weightless. If a freshly regripped club suddenly feels different in your hands, ask what changed underneath the grip, not just on the surface of it.