Manny, if you can sharpen it with a file, it will be ok. If the file skips across the area that you re hardened, you will need to draw the hardness back by placing the head into an oven at 350 degrees or so for a couple of hours. Test it again with the file. If the file still skips, raise the oven temp to 375 and do it again till the file will cut it with some resistance. That is when it is good.