MAINTENANCE AND TIPS FOR THE COBRA CLASS 3, 4, & KING COBRA, PRO 2000, ARTISAN TORO 3000, 3200,4000, Cowboy 3500, 4500, TECHSEW 5100, SEW PRO 44L, KINGMAX, MASTER LOCK, JUKI 441. AND OTHER 441 STYLE MACHINES Thread 1) Make sure that the thread you are using is not dry, old, or damaged by the elements. Keep thread in a plastic bag to help protect it. Make sure that the thread does not untwist, if so, then the bonding agents have evaporated or weren't very good to begin with. Threadin