I have seen and heard of these rods befor but never used one till the other day when I got a visit at the shop by a guy selling tools,I work on a lot of rusted salt trucks and plows in my line of work unforchenatly rust never sleeps.alot of times a bolt will brake off down in the hole no way to get out just use a drill bit and a easy out you say ok how many times have you broken off a hardend bit or easy out off in that bolt .the guy gave me a two min demo and let my try it must say i was impresed,keep in mind the stuff we used in demo was all new not all rusted and jacked up.just place nut over bolt hole fill with rod to top then mig washer to nut and out it came slicker than snot, the flux on the rod keeps the rod from sticking to the threds only to the broken off bolt.it's like playing the operation game whin you were a kid dont touch the sides.like to hear if you have used this rod befor and what your results were.