Ah yeah that will happen if you don't push the tip down hard enough. It's hard work, when I finish putting a new seat on, I am sweaty and my hands are just about at their limit. A better tool would be best haha. Was just saying the job can be done with it, assuming it isn't broken or something. Also I have had better luck depending on what kind of staple I used. I have no idea where I got them, but I had some staples that when you look at a stack of them the pointy sides look like a saw blade. As opposed to the other type where the edges are flat from the side, but cut more like a knife edge. Maybe I had better luck because I was using a different staple. Also what size were you using? 1/4"?