- String spread
- Center of the outer bass string to center of the outer treble string at the named pickup location.
- Pole spread
- Center of the first pole to center of the last pole; do not substitute bobbin or cover width.
- Pickup body
- The candidate's enclosing length, width, and installed depth. Record tabs, screws, lead exits, and protrusions separately.
- Route clearance
- The smallest usable cavity envelope after excluding curved corners, finish, shielding, wires, springs, and hardware.
- Ring opening
- The clear pass-through opening, not the ring's outside footprint.
- Screw-center span
- Center-to-center distance between corresponding mounting holes in each axis.
Use the current maker drawing for the exact model and measure the real guitar. Names such as standard, F-spaced, Trembucker, mini, or soapbar do not guarantee every external or mounting dimension.
Follow the measurement guide before using the fit tools.
Scope of this reference
Define string spread, pole spread, pickup body, route, ring opening, and mounting-center dimensions. Use Pickup Fit Measurement Reference to make a repeatable decision for this named task, not to impose one specification on every instrument.
Practical example
A 52 mm string spread is an outer-center measurement, not pickup body width. Likewise, a 78 mm screw-center span is not the ring footprint. Keep pole, body, opening, route, and mounting datums distinct in every comparison.
Record the conditions
For Pickup Fit Measurement Reference, write down instrument type, tuning, installed strings, relevant hardware, climate when material, physical datum, unit, tool resolution, and the result before and after change. A result from this reference is comparable only when its method travels with the number.
Verification checklist
- For Pickup Fit Measurement Reference, confirm the starting state and exact question.
- Repeat its critical measurements from the same reference.
- Compare its result with direct observation and applicable maker documentation.
- Change one reversible variable where the task permits.
- Retest the named symptom and preserve unresolved exceptions.
Related workflow
- measure pickup fit — continue when that page answers the next unresolved measurement or decision.
- pickup pole spacing matcher — continue when that page answers the next unresolved measurement or decision.
- pickup ring mount fit — continue when that page answers the next unresolved measurement or decision.
Limits
Pickup Fit Measurement Reference cannot inspect hidden structure, material condition, service history, or player technique. Stop this reference workflow for electrical hazards, abnormal resistance, structural movement, conflicting readings, or unplanned material removal.