Heli-coil questions

Heli coils are okay if done right and if your not constantly removing the bolt. Rather than drilling out a set screw (Allen head plug) check out a product called an ez lock. I prefer to use them at work if I have the extra material to drill and tap but if there isn't enough material I use a heli coil. Oh and there is a broken tap extractor tool. I've never seen anyone drill thru a tap or easy out. If I break a tap in a hole that not blind I punch it out from the other side. Was you using tapping fluid?