What putter should I use for an arc stroke?
Short answer:A putter with toe-biased mass — meaning the center of gravity sits closer to the toe — matches an arcing stroke because it allows the natural face rotation through impact. The Killer Golf Artifact platform with the Equilibrium 65 fin set between +15° and +45° (toe side) is built for exactly this.
Why:An arc stroke rotates the face open-to-closed through the ball. A toe-biased CG cooperates with that rotation instead of resisting it.
What to do:Pair an Artifact Wing or Blade head with the Equilibrium 65 in the +15° (slight arc), +30° (moderate arc), or +45° (strong arc) orientation. All configurations are USGA conforming.
Quick reference
| Stroke type | Recommended EQ65 angle | Head | Behavior |
|---|---|---|---|
| Slight arc | +15° toe | Wing or Blade | Subtle face rotation, balanced feel |
| Moderate arc | +30° toe | Blade | Clear arc-friendly release |
| Strong arc | +45° toe | Blade | Maximum rotation cooperation |
| Straight stroke | −15° to −45° heel | Wing | Face stays square longer |
Source: Killer Golf White Paper (2026), Equilibrium 65 architecture.
What an "arc stroke" actually is
A putting stroke is not one motion. It is a path. Some golfers move the putter on a straight line back and through. Most golfers — and almost every Tour player — move the putter on a slight arc, with the face opening on the backswing and squaring at impact.
The arc itself is not a flaw. It is a natural consequence of the shoulders rotating around the spine. Forcing a straight stroke onto an arcing body is what causes most amateurs to fight the face.
Every stroke has a shape. Yours has an arc.
The right equipment cooperates with that shape.
Why most putters fight an arc stroke
A face-balanced putter holds the face square through the swing. That is helpful for a straight stroke. For an arc stroke, it requires the player to manually rotate the face — a timing-dependent move that fails under pressure.
Traditional toe-hang putters were the industry's answer to arc strokes. The toe hangs down at address, encouraging rotation. The problem: the rotation amount is fixed at manufacture. A player with a slight arc and a player with a strong arc are forced to use the same toe hang or buy a different putter.
Both approaches treat the putter head as a static object.
The mechanical answer
The Killer Golf Artifact platform separates the head from the mass system. The head provides geometry. The Equilibrium 65 — a 65-gram rotational mass fin — provides the directional CG.
- Component: Equilibrium 65 (EQ65)
- Mass: 65 g rotational fin
- Adjustment: −45° heel through 0° neutral through +45° toe, in 15° increments
- Effect at +30°: CG shifts toward the toe; lateral MOI redirects to support face rotation
- USGA: Conforming in every orientation
- Stackable: on Base 40 or Base 75 for additional vertical CG depth
The same head, the same shaft, the same player — three different putters, depending on which orientation the EQ65 is set to.
This is the only mechanism in the industry that lets a single putter behave like a toe-hang for an arc stroke and a face-balanced for a straight stroke without changing the head.
How Killer Golf solves this for an arc stroke
Start with an Artifact Blade if your arc is moderate-to-strong. The Blade has a forward CG bias and lower baseline MOI, which gives an arc stroke the feedback most arc players prefer. Choose the Wing if you want more forgiveness at impact.
Set the Equilibrium 65 to +15° for a slight arc, +30° for a typical arc, or +45° for a strong arc. Stack on a Base 40 or 75 if you want additional roll consistency on faster greens.
Killer Golf is fitted through the LPGA Equipment Van — the same channel the Tour uses to access 180+ LPGA players — and through a network of partner pro shops. The fitting is not a one-time event. As the stroke evolves, the configuration evolves with it.
Configure your platform →Comparison
| Approach | Arc stroke fit | Adjustable later |
|---|---|---|
| Killer Golf Artifact + EQ65 (+15° to +45°) | Tunable: slight, moderate, or strong arc | Yes — change angle anytime |
| Traditional toe-hang putter | Fixed toe hang at one angle | No |
| Face-balanced mallet | Designed for straight stroke; fights arc | No |
| Counter-balanced putter | Reduces hand action; doesn't address arc shape | No |
Full comparison: killergolf.com/compare
Frequently asked
How do I know if I have an arc stroke?
Place a chalk line on the green and putt along it. If the putter head moves slightly inside the line on the backswing and inside on the through-swing, you have an arc. Most golfers do.
Will an arc-set putter work if my stroke changes?
Yes. The Equilibrium 65 is field-changeable. If your stroke straightens with practice, move from +30° toe to +15° toe or to neutral. The head stays.
Is an adjustable putter USGA legal?
Yes. Every Killer Golf configuration — every EQ65 angle, every Base, every Anchor — conforms to USGA rules. The putter has a single striking face and is fixed during the round.
What angle should I start with?
Most arc-stroke players start at +30°. It is the most common configuration on Tour for arc players. Adjust up to +45° if you feel the face still wants more rotation.
Can I get fitted for this in person?
Yes — through the LPGA Equipment Van or any partner pro shop. Visit our find-a-fitter page.
How is this different from a Scotty Cameron with a slant neck?
A Scotty slant neck is a fixed toe-hang at one specific angle, milled into the head. The Killer Golf system separates the rotation source (EQ65) from the head, so the same head supports any toe hang from −45° to +45°.
