Everyone is for the hot water method, which I admit is my favorite as well. However, since nobody else has brought it up, I will. The heater thing is generally not a good idea. Too much heat is your enemy here, as I have seen several balls put in ovens, by wood stoves, and in front of heaters break. This doesn't seem to be as big a problem with the hot water. Also, I wouldn't worry about putting anything in the holes, just clean them real good with 409 or something like that before bowling so there is no oily residue in them.
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Why, WHY won't the last one just fall?? It's WIGGLING for cryin' out loud!!