got fed up of my exhaust vibrating itself to pieces so I decided to repair the threadless exhaust mounts-
Here it is for all to see using novice vision to explain how its done-
first i removed the back panel of the car-

first we see the offending bolt holes that have no thread what so ever-

this is the helcoil kit from ebay (all you need for about £30

delivered)
the holes are drilled then tapped (supplied in the box)-

then you insert the helicoil with the pushy tool-

after breaking off the 'tang' (the metal tab you screw the helicoil in with) you can then use you bolt holes again-

sucess and easy to use the hardest part was getting the back panel on the car again after!