Thread Take-Up Cover, Brother #X77724000 : Sewing Parts Online
Amazon.com: Brother ST4031HD Serger, Strong & Tough Serger, 1,300 Stitches Per Minute, Durable Metal Frame Overlock Machine, Large Extension Table, 3 Included Accessory Feet, White, 12.99 x 14.37 x 17.01 in.
BROTHER 500-SERIES OVERLOCK UNDER LOOPER THREAD TAKE-UP RIGHT #146653001 PART | eBay