Click to expand Tap to zoom Barnett Diaprh. Spring for 84-89 Big Twin by Barnett Save £-37.24 £37.24 | / SKU MCS580277 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart DescriptionBarnett, diaphragm clutch spring. Heavy DutyDetails25% stronger than stock. Suitable for street applications. Heavy Duty replacement for OEM 37875-86A.84-89 B.T.