I am changing the oil for the first time on my 17/42 MFT. I have tried everything imaginable to remove the drain plug, but it does not budge. I'm afraid I'm going to break the elbow of the block. Is it possible that the elbow is left-hand threaded? I'm almost tempted to pull of the muffler and use the impact wrench , but I don't think that would budge it either. Any suggestions.