15-Piece Metric Thread Chaser Set, 7 Metric Rethread Repair Tool Kit, Thread Restorer Set Rethreading Kit

I used this there are a bunch of different sets on amazon find the size and thread pitch of your bolt run it in a little pull it out so the crud comes out and repeat until it goes in somewhat easy. The tool also comes in handy if you cross thread a few threads on a brake caliper bracket