Cowbell Attachment CBH50 The new, upgraded bass drum cowbell attachment (CBH50) includes a clamp and L-rod. The position and angle of the cowbell are adjustable to your preference. Now included is a specially designed angled memory lock, which makes set-up quick and prevents the L-rod from moving while playing. As well, the bass drum clamp is now equipped with rubber hoop protectors in order to prevent the hoop from becoming damaged.