Harken 45mm Single Aluminum Element Fiddle Block w/Swivel, Becket 150 Cam Cleat [6234]45mm Single Aluminum Element Fiddle Block with Swivel, Becket & 150 Cam Cleat Element blocks introduce sideplates that combine forged aluminum and compound curves for strength. They are simultaneously contemporary and very robust. Elements design pairs the minimum amount of metal required to protect the sheave with a proven journal bearing. So size for size, Element is priced significantly lower, than our previously least expensive blocks. Sideplates