Elna Lock Serger Service Manual L1, L2, L4, L5, L4D, L5D models. Here are just a few examples of what's included in this manual: * Formation of 2-thread and 3-thread stitches. * Machine adjustments and settings. * Timing the machine. * Replacement and adjustment of moving cutter. * Lubrication points. Includes great diagrams showing you step by step how to time the lower looper and more. 45 page manual.