I am not responsible for any loss or damage that may occur during shipping, so I recommend that you pack your screws carefully by wrapping them in newsprint or something similar and insuring your package for the value of it's contents. Sharpening an item will not compromise its functionality or safety. It will only make it easier, and therefore, safer to use. I do not modify or inspect any parts that deal with it's structure or safety.(ex: I don't inspect screw hangers, stress fractures in picks, etc.). If an item should fail after I have sharpened it, it would only do so because of a manufacturer defect or improper use or adjustment.
If you have truly destroyed any of the gear seemingly beyond repair, please contact me (or send it) and I'll assess the situation. I'm not Harry Potter with a magic wand, and I can't fix everything. If you have bent the tube, you might by S.O.L. If you have bent the teeth, I can probably fix it! Please be sure and leave your contact info!