Repair tools that ordinary people can use, can be done with a power drill, pneumatic drill or by hand: drilling, tapping, inserts - anyone can.
Thread Repair Kit M6 X 1.0mm, Helicoil Metric Thread Repair Insert Kit with H...
UNC/UNF/Metric Thread Repair Kit Thread Restorer Tool 42PCS Thread Chaser Set
131pcs Helicoil Metric Thread Repair Kit, HSS Drill Thread Insert Repair Tool...
15-Piece Metric Thread Repair Set Thread Restorer Set Rethreading Tool
Axle Spindle Thread Restorer Set M16-M27 SAE Metric Thread Repair Tool Kit
Labwork 15-Piece Metric Thread Repair Set Thread Restorer Set Rethreading Tool