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P/N 99944200907. Installation and Loading Instructions. Package Contents: 1 Speed-Feed® 400 LH/RH Universal Mount Trimmer Head (K). Bushings. ECHO's patented revolutionary Speed Feed trimmer head. Take the hassle out of refilling your trimmer head by using the easiest loading tap to advance headTrimmer head halves will snap together tightly only if parts are properly assembled. 4. counterclockwise to tighten. Turn "RH" stud clockwise to tighten. Trimmer head is now fully loaded and ready for operation. When the wear indicators located at the bottom of the. Speed-Feed® head are worn smooth, or if holes The Speed-Feed® trimmer head is the fastest loading bump-to-advance style head on the market. In fact, it can be reloaded without disassembly in 30 seconds