Luc, sailmaker in La Rochelle and installer of the Tides Marines solution : “The one-piece bottom-to-top rail requires no screws to attach. There is therefore no risk of losing parts (no balls either) or of having to retighten them during the life of the boat. When it comes to maintenance, it is important not to use a greasy product sprayed on the rail. On the contrary, just a rinse with fresh water, see a wash with soapy water, but no more !”
https://services.cloud4.sbg.meosis.fr/nautex-international/en/rail-mainsail.html