Most players can tell you what flex they play. Almost nobody can tell you what their shafts weigh, and weight does more to how a set feels than flex does.

Here's the short version: shaft weight changes tempo, where you feel the clubhead through the swing, and how much the club tells you about where the face is. Flex changes how much the shaft bends. Players get sold on flex because it's printed on the shaft in big letters, and then wonder why two stiff sets feel nothing alike.

What weight actually does

A lighter shaft — say a 105-gram iron shaft — lets you swing faster with the same effort. It also gives you less feedback. The head feels further away, the transition happens sooner than you planned, and if you're already a quick-tempo player it can get away from you.

A heavier shaft — 125, 130 — slows the transition down and puts the head somewhere you can feel the whole way through. It also costs you a little speed, and if you're not strong enough to move it, it costs you more than a little.

Neither of those is better. They're different problems, and which one you have depends more on your tempo than your handicap.

The thing people get wrong

Weight gets picked off a chart from swing speed. Swing speed is the worst single predictor we see in the shop.

Two players at 85 mph will want different weights if one has a smooth, long transition and the other snatches it from the top. The smooth player can usually handle more weight than the chart suggests, and often wants it — it gives them something to load against. The quick player frequently does better lighter than the chart says, because the heavy shaft is arriving late and they're fighting it.

Strength matters too, and it isn't the same as speed. A strong, slow swinger is a different fit from a fast, light one at the same number.

How we actually sort it

We stock Nippon's Modus3 Tour line across the whole ladder — 105, 110, 115, 120, 125 and 130. Six steps, close together on purpose, because the useful differences in this are small.

Demo shafts are $15. The point isn't to try all six. It's to take two that are far enough apart to feel different — 105 and 120, usually — put them in the same head, and hit them back to back. You'll know inside a dozen balls. Nearly everyone does, and most people are surprised by which way it goes.

Then we narrow. If 120 felt better than 105, the question is whether 125 is better still, or whether you've gone far enough. That's a second demo and another dozen balls.

The whole exercise costs $30 and settles a question that otherwise gets guessed at for the life of the set.

A few things worth knowing before you order demos

Hit them on grass. A mat flatters a heavy shaft, because you can't take a fat divot and get punished for it. The demo program exists so you can do this on your own course.

Keep the head the same. If you change heads and shafts at once you've learned nothing. That's why demos go out as a single shaft in a head you're already used to, not a full set.

Don't do it on a day you're playing badly. You'll pick the shaft that rescued one swing rather than the one that fits the swing you usually make.

Wedges are a separate question. Most players want their wedge shafts a touch heavier than their irons for stability on partial shots. We stock Modus wedge demos in 105, 115 and 125 for the same reason.

When weight isn't your problem

If your misses are left and right rather than long and short, weight probably isn't it — lie angle usually is, and that's a different and cheaper fix. If your dispersion is fine and your distances are inconsistent between clubs, that's more often a gapping or loft question.

Shaft weight is worth solving when the set feels wrong rather than goes wrong.

Questions on any of this — DMs are open, or request a build and we'll talk it through.