Information, please. I know that fold lines in a khukuri are not good, but I know little else about them. I assume a fold line is created when the kami literally folds the steel back on itself to hammer it out but the folded portion fails to properly "weld" to the other; is this correct? Next, are fold lines always obvious? How do you recognize a fold line? To what degree do they weaken a blade? And if they do not extend into the cutting edge of the blade, are they a problem? Thanks