[onewhippedpuppy]

You have to watch the tip you use. Maybe you can get your old bit out with the springy looking extractor tip. If you get the old one out, don't waste your time with the springy thing anymore, use the triangle shaped one with the serrated edges. It may take multiple shots at whatever is in there, but is should eventually punch through. When you're done, make sure you run a hose through it to be certain it's clean, I don't think you want to be doing this again.