In embodiments, the invention includes a device for supporting motion of a bow with respect to a bowed string instrument such that motion of the bow is constrained to approximate good playing form. An embodiment includes a clamp for attaching the device to a bowed string instrument, a hinge, and a guide tube. The invention also includes a method using the device, wherein a student learning to play a bowed string instrument may develop good playing form and create a muscle memory associated with such good playing form.