This may be a stupid question but what is this and how do you use it? My neighbor took me to one of his wifes friends for a garage sale last summer and I aquired this. It was her fathers and she wanted me to have it. Unfortunately after I said OK she charged me $10 for it. Oh well. I was in the garage a couple of weeks ago and found it & figured I'd ask. Also, once I find out what it is and how to work it, how do you sharpen it? As it is the cutting edge is not straight. The outside edges hit before the middle of the blade. Any info is appreciated.