This Shim Set Includes:
Purpose: Reducing the Gap between the mouthpiece and leadpipe could dramatically improve the playability of your current trumpet setup.
How to achieve optimum Gap:
- A Set of 10 Gap Shims in 5 different lengths
- installation and removal instructions complete with graphics and video
- links to Harrelson Trumpets research, development and science behind closing mouthpiece gap
- choice of venturi (.340 and .345)
- choice of outside diameter (small and standard)
Purpose: Reducing the Gap between the mouthpiece and leadpipe could dramatically improve the playability of your current trumpet setup.
How to achieve optimum Gap:
- 1) Measure your current gap with the Gap Measurement Tool or with a caliper
- 2) Determine your target gap - usually .060 to .100 inches
- 3) Medium & Wide Gap: Insert appropriate gap shim inside the receiver with the Venturi Measurement Tool (sold separately)
- 4) Narrow Gap: Some players may also find they would like to reduce length of mouthpiece shank
