Sailfeeders for fast, precision, smooth sail hoists. Features and Benefits. Reduced weight for same strength. Electro Polished 17-4PH high grade stainless steel. One piece precision investment casting for ultimate strength. Mainsail feeder RF/MA locates in the mast track. below the luff entry and protects luff tape during the hoist. No drilling is needed. Headsail feeder RF/H guides any flaked genoa from the deck cleanly up into the foil. Headsail feeders are supplied with a length of line for attachment in their correct free pivoting position between luff entry and deck. Graphite loaded, anodised alloy rollers.