Yamaha Clamp - 90465-20M78-00. Durable Yamaha Clamp for Secure and Reliable Component Attachment. The Yamaha Clamp - 90465-20M78-00 is a high-quality, durable clamp designed to securely fasten components on your Yamaha equipment. Whether you are performing routine maintenance or replacing worn-out parts, this clamp provides a reliable and long-lasting solution. It is engineered to withstand harsh conditions and ensure your equipment remains stable and safe during operation.. Key Features. High D