If you want to fine tune the spring tension and arm height of your Bigsby vibrato here's the kit for you. The four springs are 1.119", 1.022", .880" and .690" tall giving you a very wide range to play with. The white plastic washer goes under the spring and offers another way to modify the height slightly. The red fibre washer goes under the handle. Brand New. Genuine Bigsby Part 1802775006. UPC 717669814120.