My mom is a wonderful woman, but not a rich one. She bought me a walmart utility knife today, which is a big deal for her as she is very frugal and I'm very touched by her having done this. I can't use the damn thing for much though because it's serrated and the edge wouldn't be straight even if it were, I don't have the receipt and have already used my receiptless return for this year at walmart so I can't just go trade it in unless I tell her it's totally useless and I need the receipt; basically a slap in the face but I'm in desperate need of a utility knife until I can afford one for myself. So the question is can I regrind the edge on this knife without just ruining it? If not I'm going to be forced to ask for the receipt because no, I can't afford an $8 Victorinox or the like (no, I'm not exaggerating, that's literally above my budget right now) My only tactful option is to regrind using a friends tools but I'm afraid it has a pig iron core and if I grind it out and that ends up being the case I pretty much can't do my job correctly and my whole life gets even more screwed than it currently is. I'm pretty much at my wits end here, I'm on the street, I'm on the very edge of being fired for not having the proper tools to do my work and I'm new in a town a thousand miles from anyone I know except my mom, if I mess this up my whole life is messedand I don't know whether I need to insult the only person who cares about me in the whole state. HELP!