When cleaning a clogged extruder nozzle with a power drill, do not, I repeat, not have Pussycat Dolls videos playing on YouTube in the background.
For that matter, you probably shouldn’t try to clear a clogged extruder nozzle with a power drill under any circumstances.
Usually I leave my nozzles in a shot glass full of acetone for twenty minutes, then use the drill bit by hand to snake out a bit of cruft. Then back to acetone to soften up the newly exposed plastic, then drill, then acetone, then drill, then acetone yada yada yada until the cows come home.
This time I said to myself, “Zheng, old chap, this is awfully slow. You should apply a tremendous amount of torque to this expensive part while not paying attention. That will resolve this problem with minimal downtime.”