Re: Flattening an engine key?
Ok, i'll bite. I have installed 100's of keys into shafts and have NEVER flattened out a key to get a better fit. I've also installed 4 keys in go devils and i've never hammered one flat? Not 100% sure but, i'd go back and read those directions again to make sure you comprehend what you've read.
IMO I wouldn't hammer any key flat, regardless of what it was going into. I've had to "tap" on a bunch of them to get them to seat, but "tap" not hammer.