I have used this only once, but it worked as advertised! I have never tapped a thread before this. I used it to repair a stripped 5mm x 0.8 thread on my aluminum bike frame that was holding my (very heavy) rear rack and fender on. A few bumpy rides later and everything is still nice and snug threaded through the helicoil. I did use a dab of JB Weld inside the drilled hole to give the helicoil some extra grab...not sure if it's necessary or not, but gives me some piece of mind.
Rating: [5 of 5 Stars!]