About 2 years ago, I bought a used Concerto German bow from Weinkrantz music in California as a "backup" bow to my 1950s Samuel Kolstein bow. In the last year I was diagnosed with De Quervaine's tenosynovitis, which is a swelling and inflammation of the tendons on the thumb side of the wrist. I was very hesitant to give up playing the Kolstein bow, but the pain was too much and so I started using your bow more and more frequently. I now use it almost exclusively and am almost pain-free in my the playing of my bow arm. I look forward to adding an S4 or S6 bow in the future.