I was looking at Time-Serts web page and they have a Big-Sert that's supposed to fix a Heli-Coil insert. Anybody try that?

 

Yes, I have, worked great. Highly recommended. I keep up about 11 Fed Ex trucks for some local contractors, and have 7 5.4's under my care. The previous mechanic had used the Heli Coil kits from Advance and over time I've redone all of them with the Big Sert. It was well worth the investment for me.