Or you can use a thread insert like Heli Coil / Time-Sert.andrew.ashton wrote:What about using a thread-forming liquid? Permatex and Loctite, amongst others, make this stuff. If you search those product names + "thread forming liquid" on Google / YouTube you will find available products and How To videos.
Helicoil official agents in South Africa are: FAS (Pty) Ltd, Unit A1 Wesrihan Park, 160 Venturi Crescent Hennopspark, Centurion
Phone +27 12 653 7510