Dear Mr. Kooiman, I wrote to you a couple of years ago concerning my daughter, Sarah, who had severe tendon problems from playing the clarinet. After weeks of not playing, and having physical therapy, she began playing again, this time using your Maestro thumb rest. It has been wonderful, and we have had absolutely no problems since! We bought a second (Etude) for our spare clarinet, and now we have bought a third (Maestro) thumb rest for our newest R13 Buffet clarinet.