3D printed sail stopper

Not to waste the material on smth totaly useless while experimenting with 3D print I have design sail stopper for my mast.
The function is simple: prevent the sail from going out of likspår but allow easy removal in case of reefing etc. 
Metal reinforced PLA plastic is perfect for that, shielding alu mast and stainless nut from each other, inhibiting galvanic oxidation.
The part fits perfectly!