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Freemove Freeride- Slalom View All Sails Aerotech Naish Simmer XO Sails Beginners & Kids Freeride & Slalom Wave & Freestyle View All Booms Aeron Naish Simmer Streamlined Boom XO Aluminium Carbon Beginners & Kids View All Masts Epic Gear Naish Simmer Beginners & Kids RDM 30%-60% RDM 70%-100% SDM 30%-60% SDM 70%-100% View All Accessories Bases & Extensions Boom Heads & Accessories Clothing Equipment Bags Fins Footstraps & Traction Helmet Harness Harness Lines Impact Vests Roof Straps & Pads Shoes & Boots Tools - Parts - Repair Uphaul Wind Foil Boards Exocet Naish Progressive Simmer Slingshot Tabou Dedicated Foil Foil Ready Sails Aerotech Naish Simmer XO Sails Foils Exocet Naish Simmer Slingshot ALUMINUM CARBON Foil Parts Bags Fuselages Hardware Leashes Masts Pumps Wings Wing Foil Boards Exocet KT Quatro Naish Progressive Simmer Slingshot Tabou Wings Dakine KT Naish Simmer Slingshot Foils Exocet Naish Simmer Slingshot ALUMINUM CARBON Foil Parts Bags Fuselages Hardware Leashes Masts Pumps Wings Sale Windsurfing Boards Booms Masts Sails Others Wing Surfing MENU Open menu ALL CATEGORIES WINDSURFING Accessories Bases - Extensions & Parts Boom Heads & Accessories Clothing Equipment Bags Fins Footstraps & Traction Helmets Harness Harness Lines Impact Vests Roof Straps & Pads Tools - Parts - Repair UpHaul Wind Meter Boards Exocet Quatro Simmer Tabou Wave - Freemove Freeride- Slalom Recreational / Kids Wind-SUP Booms Aeron Epic Gear Naish Simmer Streamlined Boom Aluminium Carbon Beginners & Kids Masts Epic Gear Naish Simmer Beginners & Kids RDM 40%-60% RDM 80%-100% SDM 30%-60% SDM 70%-100% Sails Aerotech Naish Simmer Beginners & Kids Wave & Freestyle Freeride & Slalom WINDFOIL Foil Boards Compatible Boards Foil Boards Hydrofoils Windsurf Foils Wing Foils Foil Parts Foil Hardware Foil Masts Foil Wings WING Wing Foil Boards Naish Simmer Slingshot Wings Naish Simmer Slingshot Accessories Bags Leashes Paddles SUP Boards Exocet Simmer SALE Boards Booms Masts Sails Others Nav Menu 4 Nav Menu 5 Nav Menu 6 Nav Menu 7 Nav Menu 8 Home > Windsurf > Accessories > Bases & Extensions Sort By: Price: Low to High Price: High to Low Most Popular Title Manufacturer Newest Oldest Availability 45 per page 90 per page 180 per page 270 per page 450 per page Page of 2 Streamlined Twist On Mast Bases - Euro Pin Our Price: $99.00 Streamlined Twist On Mast Bases - US Base cup (Single Bolt) Our Price: $99.00 Streamlined Twist On Mast Bases - Euro Pin Monoblock Our Price: $119.00 Streamlined Quick Lock Mast Bases - Euro Pin (2 Bolt) Our Price: $110.00 Streamlined Quick Lock (2 Bolt) Mast Bases - US BaseCup Our Price: $110.00 Streamlined Quick Lock with Boge powerjoint Our Price: $110.00 Streamlined Quick-Lock Universal - Euro Pin Our Price: $55.00 Streamlined Quick-Lock Universal - US Base Cup Our Price: $55.00 Streamlined Red Line RDM Extension Our Price: $149.00 Streamlined Red Line SDM Extension Our Price: $149.00 Streamlined Quick-Lock Plate Only Our Price: $55.00 Streamlined Replacement Tendon Joint Our Price: $22.00 Replacement Tendon Joint for Aeron, Simmer, Goya Our Price: $17.00 Replacement Tendon Universal Joint Our Price: $17.00 Chinook Tendon Universal Joint Our Price: $19.25 Simmer Style Mast Base Our Price: $69.00 Simmer RDM SX6 Aluminium Extension Our Price: $99.00 Simmer RDM SX8 Carbon Extension Our Price: $145.00 Simmer RDM SX10 Carbon Extension Our Price: $159.00 Simmer STD SX6 Aluminium Extension Our Price: $99.00 Simmer RDM SX4 Aluminium Extension Our Price: $79.00 Simmer RDM SX4 Aluminium Extension Our Price: $84.00 Simmer RDM SX4 Combo Extension + Footbase Our Price: $138.00 Simmer RDM SX6 Combo Extension + Footbase Our Price: $158.00 Simmer SDM SX4 Combo Extension + Footbase Our Price: $138.00 MFC volcano pad Our Price: $11.00 Aeron Extension RDM Euro Pin & US Cup w $99.00 Aeron Extension SDM Euro Pin & US Cup Our Price: $79.00 Dynafiber RDM Extension US Cup 45cm Our Price: $99.00 Sale Price: $39.99 Savings: $59.01 Fin tab & screw Our Price: $2.50 US screw & plate Our Price: $3.50 Power Box Brass insert Our Price: $3.50 Streamlined Euro Pin Only Our Price: $10.00 T-Nut Channel Insert 8mm Our Price: $4.00 Streamlined Extension Collar And Pin RDM & STD Our Price: $18.00 Base Cup With Double Button Our Price: $18.00 Chinook Universal rubber Joint Flex Our Price: $24.00 Replacement Double Push Pin 3/8 Our Price: $6.00 Fin screw 1/4 x 20 Our Price: $0.90 Fin screw 6mm Our Price: $1.20 Dakine Wai Wai Base Pad Our Price: $15.00 Vent Slot Screw Aluminum Our Price: $8.00 Chinook Fin Fast Our Price: $5.00 Streamlined Security Latch Our Price: $5.00 Aeron & Simmer RDM Auto Collar Our Price: $18.00