I am an adult intermediate student. My current teacher has limited use of his left hand. Specifically, he is missing two fingers. As I progress, I am finding that this is becoming an issue. He is unable to demonstrate proper technique. He seems to be knowledgeable of the correct literature to assign, and did study the pieces himself prior to his injury. He somehow has learned to compensate, and is able to play jazz improv. I am not sure if I should look for another teacher. I am progressing ,but I wonder if I am limiting myself with a teacher who is not able to play what I am trying to learn.