installing fenders on my 1990's mountain bike, all the mounts are there. front one went fine. back one, I guess the thread was messed up. long story short I broke the screw off in the mounting hole flush to the metal

have been trying to not go to the bike shop and do things myself.

Advice needed on how you would extract the remaining part of the screw and then fix the threads so the fender can be mounted

I'm no handy man and don't have a ton of tools, but do have a good drill, wrenches, etc.

​​​​​​​thanks