Hohner Service Workshop Harmonica
Hohner instruction workbook or service manual.
Some important questions are answered here:
* Which tools do you use for what?
* How do you use the tool optimally
* What should you pay attention to when modifying / adjusting / tuning your own harmonica
* What possibilities are there and how do you approach this yourself?
In short, all in's and out's about harmonica tools / adjustment / use and application