Lower Looper for Brother Portable Sergers Part no: X77774001 (X77774-001) Compatible with Husqvarna Viking models: 660CD, 680CD What this part is - A replacement lower looper designed for Brother portable sergers - Provides a direct replacement to help restore proper loop formation during serging Key benefits - Compatibility with specific machines: fits Husqvarna Viking 660CD and 680CD in addition to its stated use with Brother portable sergers - Supports consistent stitch quality by replacing a worn or damaged lower looper - Ready-to-use replacement part to minimize downtime during serger maintenance Key attributes - Function: lower looper replacement for portable sergers - Compatibility: Brother portable sergers; Husqvarna Viking 660CD and 680CD - Size: not specified - Material: not specified - Performance: designed to restore normal looping action and stitch formation when installed as a replacement part Use scenarios - Scenario 1: During routine serger maintenance, replace a bent or worn lower looper on a Brother portable serger to restore stitch formation on seams and edges. - Scenario 2: In a home or small shop setting, keep this part on hand as a spare to quickly recover productivity when a lower looper failure occurs on Husqvarna Viking 660CD or 680CD models. - Scenario 3: When servicing a portable serger that requires a compatible lower looper, use this part as the replacement to maintain reliable operation and consistent threading performance.