Adjustable Performance Tools - Harrelson Trumpets

gap solutions made simple

Increase Flexibility

Adjust Slotting

Increase or Decrease Air Flow

Harrelson solutions simplify the process of Solving Mouthpiece Gap issues

How to achieve optimum Mouthpiece Gap in 3 easy steps - Part 1

Achieving Optimum Mouthpiece Gap in 3 Steps - Part II

Harrelson Shim Kit to reduce gap: A Survey of Thirty-one Mouthpieces

Mouthpiece Gap Measurement Tool

$48.00

Mouthpiece Venturi Measurement Tool

$52.00

Complete Mouthpiece Gap Solution Kit

$125.00