I have a bundle of drive punches from Tandy. I'm not impressed. They don't always cut after one blow, and they often need coaxing to get back out of the piece. I've have a project coming up that needs a LOT of 1/8" or slightly larger holes, so I'm thinking that before I start I will either invest in a set of higher quality, and/or attempt to sharpen. Does anyone have any recommendations they'd like to make regarding quality brands, and sharpening instructions?