Professional Trombone RepairThe BoneyardThe Boneyard is the Workshop of John SandhagenJohn is a Bass Trombone Player as well as a repair technician.The Boneyard has been taking care of trombone players for over 30 years. WHAT I DOServices View All Services 01.Cleaning 02.Dent RepairThis is a short description elaborating the service you have mentioned above. 03.ProcurementThis is a short description elaborating the service you have mentioned above. Boneyard EventAn annual event held the Sunday after Easter. Trombones, Hot Dogs, Music and Friendship