Review on 🔩 E-Z LOK 319-5 External Threaded Insert, C12L14 Carbon Steel, Meets AISI 12L14, 5/16"-18 Internal Threads, 7/16"-14 External Threads, Length 0.437", Made in USA (Pack of 10) by Kyle Costello

This little device saved me. I tore off the spigot from the cylinder head bolt. After drilling it out it turned out to be too big for a standard screw. You simply drill the right size hole for the insert, cut the hole and screw in the insert. You can use a flathead screwdriver, although I chose to purchase a dedicated insertion tool. The head is tight with no slip and my tractor runs great. The red thing in the thread is the thread blocker. It holds the insert firmly in place.