"You can't make a better instrument than you can play" 
This quote, attributed to Franz List, refers to the opinion that the quality and refinement of of a musical instrument is directly related to the musical skills and knowledge of the maker. In other words, making a concert grade instrument requires concert level musical skills. 
During the 11 years I studied music in college, I accumilated 5 advanced degrees in Music Education and Performance, including the first one ever awarded for classical Concertina (1997). 
For the first 20 years of my career I taught at several institutes, performed, and published extensively. 

The limitations of the vintage concertinas I played, forced me to 'rebuilt' them, making them suitable for concert use. changing airflow values, reshaping reeds, improving harmonic unity, dynamics, actions, etc . These 10+ years of rebuilding vintage concertinas formed the foundation of Wakker Concertinas. 
The following  recordings were made during this period. The instruments featured, were either built or restored by me.