I found some nice seats. But they were too tall I couldn't see around them. I broke one of my four seat bolts when taking the seat out. So I started drilling with thinner bits I broke a few. I bought cobalt and broke some of those. Luckily I was able to pull them out. So I bought a thicker cobalt but it doesn't do anything to the bolt. There is a hole a ways down in it from the thinner bits. I tried the extractor. It pounds in but it won't grab and spins free when I try to back it out. Only thing to do is use thinner bits but when they break they won't drill out. Any tips or ideas? Apart from using thinner bits with oil or something to hopefully stop them from breaking I don't know.