Windsurf gear Spare Parts Windsurf Mast Extension Spare Parts Mast Extension Spare Parts Push Button Extension + Spring (Grey) Mast Extension Push-Button + Spring (Red or Black) Modified Adjustable Collar RDM HD Extension Adjustable Collar RDM Elite Extension Adjustable Collar SDM Basic Extension Adjustable Collar SDM HD Extension Adjustable Collar SDM Elite Extension Stainless Steel Pulley Block for RDM and SDM PRO Extension Ring + Pin RDM Extension Premium Downhaul Rope 4 mm - 200 metres Full Dyneema Downhaul Rope 40 mm - 100 metres Formuline Downhaul Rope 38 mm - 200 metres