Mercury - Manual Starter Rope Line Engine Starting System Braided Nylon 12066K10. Overview. There's something timeless about pulling a manual start rope - that quick tug, the clean resistance, and the moment your motor fires to life. The Mercury Marine 12066K10 Manual Starter Rope Line is built for that moment. Made from durable braided nylon, it's flexible, strong, and dependable, season after season. Whether you're starting a small tiller on a quiet lake or cranking up a workhorse outboard at