The Fingers Overdrive Drill Template
PedalPCB · 125B
Template details
- Circuit
- The Fingers Overdrive
- Vendor
- PedalPCB
- Enclosure
- Hammond 125B
- Dimensions
- 63.6 × 119.3 × 35.8 mm
- Layout
- 125B 4-Knob (Type 1)
- Category
- Overdrive
Export formats
- PDF: print at 1:1 scale
- SVG: vector graphic
About this drill template
Drill template for the PedalPCB The Fingers Overdrive, sized for a Hammond 125B enclosure (63.6 × 119.3 × 35.8 mm). The pre-positioned holes match the PCB's pot footprint exactly, with the footswitch centred below the 4-knob layout. Print at 1:1 scale, tape to the enclosure face, centre-punch, and drill. PCB and parts not included.
Most overdrives owe their voicing to the same handful of mid-bumped tone stacks (the Tube Screamer shape being the most copied) and tweaks to clipping diodes, cap values, and the gain pot taper give each design its identity. The drill template gives you the hole positions; the rest is in the values on the board.
Build notes
Four-knob layouts are dense but manageable: the pots are spaced wide enough to grab individually, with the footswitch centred below.
The Hammond 125B is one of the most common DIY pedal enclosures: a touch larger than a 1590B, slightly smaller than a 1590BB, with room for almost any single-effect PCB plus 9V supply.
Vendor specs: Designed for a 125B enclosure with top-mounted jacks
Controls
- Volume
- Drive
- Treble
- Bass
Drill measurements
Hole centres for the 125B 4-Knob (Type 1) layout. X runs left to right from the centre of the face being drilled. On the enclosure face, Y is measured from the centre, positive towards the top. For holes on a side, Y is the distance down the wall, measured from the face edge. Export the PDF for a 1:1 printable version with a scale check.
| Hole | Face | X (mm) | Y (mm) | Diameter |
|---|---|---|---|---|
| Pot | Enclosure face | -16.5 | 38.1 | 7 mm (0.28 in) |
| Pot | Enclosure face | 16.5 | 38.1 | 7 mm (0.28 in) |
| LED | Enclosure face | 0 | 25.4 | 6.4 mm (0.25 in) |
| Pot | Enclosure face | -16.5 | 12.7 | 7 mm (0.28 in) |
| Pot | Enclosure face | 16.5 | 12.7 | 7 mm (0.28 in) |
| Footswitch | Enclosure face | 0 | -45 | 12 mm (0.47 in) |
| DC Jack | Top side | 0 | 14.2 | 8 mm (0.31 in) |
| Jack | Top side | -15.2 | 24.3 | 9.5 mm (0.37 in) |
| Jack | Top side | 15.3 | 24.3 | 9.5 mm (0.37 in) |
Jig A covers 125B 4-Knob (Type 1)
Drop it over the enclosure, punch a mark through the holes this build uses, then lift it off and drill. It wraps onto the sides too, so the jacks and DC socket are covered.
Both jigs, $12 →