ocr: The instruments The Bow Button. The button is the screw mechanusm at the verye end of the bows stick that regulates the bow-hair tension. Turning the CIEw ine either irection slides the frogup OT down a track within the bow stick, increasing or descreasing the tension on the bow hair. Eany bows had TO buttons and the tension was regulated ruch more crudely. The modern button allows the performer a
