The clapperhead found on chimes C4-C8 is secured by a single clapperhead mount screw in the clapper bushing. While a round felt or rubber head is assembled onto the C4-B4 clapper shafts, C5-C8 have clapperheads with a series of holes, slots, and a solid area, one of which is aligned at the point of impact. The correct position for best sound quality has been selected at the factory and no attempt should be made to change it. The clapperhead is not adjustable as it is on Malmark Handbells. Do NOT attempt to rotate or force it into another position, or you may loosen the bushing from the clapper shaft.