Yup, unless you get very lucky and the bit snaps off leaving enough of it sticking out to be able to grab it with a pliers or something similar, you are basically screwed.
Well this thread is depressing as hell. I now have to reconsider the way I built my chillerblocks as if myv65 is correct, my flow in the top few channels is just about nonexistant. They perform adequately but I am always looking for improvement. Back to the drawing board.
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