Replacement Accessory: The windsurfing mast plantar joint is a ‑performance replacement component. It is installed on the surfboard via a glue paddle base, and the sail is mounted on this joint. Flexible steering: The base board rotates at the joint; when the lower end is fixed, the upper end can rotate to adjust the sail direction. Durable materials: The sail base board is made of PVC, nylon and stainless steel, delivering strength, sturdiness and long lasting durability. Easy installation: With stainless steel M8 fittings, installation is straightforward and resistant to loosening. Key benefits Replaces worn or damaged mast base to restore reliable performance on windsurfing boards. Provides adjustable sail direction through a rotating joint, enabling precise control in varying wind and water conditions. Built for durability in harsh marine environments thanks to a PVC/nylon/stainless steel construction. Simple, secure mounting with stainless steel M8 fittings that stay tightened during use. Specifications and features Material: PVC, nylon and stainless steel. Fittings: Stainless steel M8. Mounting method: Glue paddle base to the surfboard; sail attaches to the joint. Function: Rotating joint on the base allows flexible sail orientation while the lower end can be fixed for stability. 23 use scenarios Replacement on an older windsurfing setup: Swap in this mast plate joint to restore a reliable mounting point and regain full sail control without replacing the entire rig. Competitive or mixedconditions sailing: Use the rotating upper joint to finetune sail direction in upwind or reach courses, improving handling in wind shifts. Retrofit or rental/training boards: Quick retrofit on boards that use a glueon base; easy to install with M8 fittings for quick setup and dependable retention during sessions.