Elna 683-686 Overlock Sewing Machine Instruction Manual. includes: Threading your machine, Changing needles, Check tension disks, Control sewing speed. The Elna 683 offers you the choice of sewing with either 3 o 4 threads. Just a few of the features of this 4/3 thread overlock include differential feed, Elna 683 Overlock Sewing Machine Instruction/Owners Manual. 83 page instruction manual. Please provide an email to which your pdf manual can be.Dec 1, 2015 - Elna 683-686 Overlock Sewing Machine Instruction Manual. includes: Threading your machine, Changing needles, Check tension disks, Elna 683-686 Overlock Sewing Machine Instruction Manual. Includes: * Threading your machine. * Changing needles. * Check tension