Review on 🔧 Revive and Restore Threads with 1221-306 Thread Repair Kit – Thread Kits by Mike Groover

Works great and a lot cheaper than the Helicoil brand. For fixing torn off threads on the valve cover. Couldn't start it with the blue part but got in right away without it, just the black part. I don't know if it was just me or the instrument. But yes, saved me a lot of time and torque. I haven't used the red T-handles on Amazon, but judging by the photos and reviews, if you don't want to spend $100 on a signature brand, these are the ones you need.