I should clarify. I bought my track bike on craiglist and the previous owner had stripped the teeth to remove the cups. He then drilled the cups to use some short of clamp to tighten it down. Unfortunately, that made it very difficult to remove. My LBS had to get creative to remove it. But, the grooves and gashes were actually there before the LBS. Don't know why you would ever do this. Those little bits to the right are the teeth to the cups.