I had to repair the threads on the timing belt tensioner screw on my Civic. The heli-coils I'm familiar with have a coil shaped insert. I went with a TIME-SERT (Specifically
Amazon.com: TIME-SERT M6 X 1.00 Metric Thread Repair Kit 1610: Automotive) and the inserts are thicker and one solid piece. Considering how critical that one hole is, I wanted to have the best chance at fixing it.