4.5° toe-up at impact
His hands sit lower at impact than his old putter's 72° lie was built for.
Built 67.5° lie, so the sole sits level at impact.
Build file 001 · Custom fit
One golfer. One curve.
This is a real custom fit, start to finish. A right-handed golfer brought in his SAM PuttLab session. We read every number, changed what needed changing, kept what already worked, and drew a face that exists for nobody else.
- 5 measured putts
- 10 build decisions, each tied to his data
- One equation for the face
Open full size ↗
Read the data
What we saw. What we built.
Every part of the build answers something in his stroke. Where his old putter already suited him, we kept it.
6.1 mm toward the heel
Average strike point. Only 1 of 5 putts landed inside SAM PuttLab's ±2.5 mm band.
Built Center of gravity moved 6 mm heelward to meet his strike. Sightline stays at face center, where he aims.
9.5 mm average strike height
Strikes ranged 7.7 to 14.1 mm up the face, and rose slightly as he added press.
Built 22 mm face, CG at 9.5 mm, and a convex Parabola curve that adds loft toward the top edge.
0.29 backswing ratio
Short backswing, long follow-through. Below the 0.33–0.40 band on all five putts.
Built 365 g head, 5 g heavier than his old one, to support a longer, smoother backswing.
2.35° face rotation before impact
Just above the 0.8–2.3° band in the last 10 cm. Rotation after impact was already in range.
Built Midsize reverse-taper grip with a flat front to quiet the hands through impact.
Kept what already worked
Tempo, timing, rotation rate and on-plane delivery all sat inside their bands.
Kept 35 in length, 2.0° built-in forward press, lie-balanced center shaft.
The curve
One equation. Every height on the face.
His face is defined by a single parabola in side view. Loft at any height falls out of it. The curve is shaped so his higher strikes, which naturally launch lower, meet a little more loft.
z(y) = 0.05503·u + 6.827×10−4·u²u = y − 9.5 mm
y = height above the sole · z = setback toward the back of the head · convex top to bottom, flat heel to toe
| Height | Loft | Depth from flat |
|---|---|---|
| 22.0 mm (top edge) | 4.12° | 0.107 mm |
| 20.0 mm | 3.97° | 0.075 mm |
| 15.0 mm | 3.58° | 0.021 mm |
| 9.5 mm (his strike) | 3.15° | 0.000 mm |
| 5.0 mm | 2.80° | 0.014 mm |
| 0.0 mm (sole) | 2.41° | 0.062 mm |
0.107 mm. The deepest the curve gets, at the top edge. About the thickness of a sheet of paper, held to ±0.02 mm.
The result
Every putt in the window.
SAM PuttLab's target window for delivered loft is 2.0–3.5°. We re-ran his own five putts on the new face.
Modeled from his session data using the build's geometry, not a re-test with the finished putter. His original numbers are corrected for his old putter's 2.0° of built-in shaft lean.
Putts in loft window
4 of 55 of 5
Old putter → Parabola face
Average delivered loft
2.82°2.98°
Now near the middle of the window
Average launch
2.31°2.42°
Window 2.0–3.5°
The build sheet
His putter, on one page.
Parabola curvez = Bu + Au²Convex, 0.078°/mm
Loft3.15°At 9.5 mm, sole flat
Face height22.0 mmCG 9.5 mm high, 6 mm heelward
Head weight365 gLie-balanced, center shaft
Lie67.5°Sole level at impact
Shaft press2.0° fwdBuilt-in forward lean
Length35 inSteel, straight shaft
GripMidsizeReverse taper, flat front
Head: perimeter-weighted mallet. Built to the USGA equipment rules for putters: convex face, no concavity, loft under 10°, lie under 80°.
Your turn
Get a face drawn for you.
Custom fit is $350. Join the build list, take the 5-minute questionnaire, and we'll work from your answers.
Have putting-lab or launch-monitor data? There's a section for it in the questionnaire, and we'll use it the same way we did here.