I use a 1/4" diamond tip core drill bit to make holes in the bottom of bowls to use them as plant pots with drainage. I bought the diamond core drill bit to drill ceramic bowls, however I also used it to drill 1/4" into plastic bowls, and this was a mistake. The plastic is wedged so tightly inside the bit that I cannot get it out. I have tried getting it out with an awl, a safety pin, a nail, a knife, etc. and no luck.
Any ideas? All I can think of is to secure the bit in a vise, and try to drill out the plastic with a smaller bit.