The Gunsails Tendon HD base with U-pin is easy to handle: simply place the enclosed slot nut in the rail, attach the mast base and tighten. The included plastic shim prevents scratching of the board when twisting on. The special feature of this mast base: stainless steel pin and top are made of one piece, so the U-pin can never unscrew and thus ensures you more safety. In addition, the security rope engages in case of breakage.
> Fitting for all U-Pin extensions
> With Security Rope