I know it seems like a simple enough thing to throw a couple spikes on a stapler, but it's harder than you might think. You have to take into consideration if you want it to stapler afterwards, if you want to use it to bash skulls, how even you want the spacing on the spikes, and so on.

The first thing you have to do is find the right stapler for you. The easiest way to put spikes on is to just glue them. If you just want to glue them on, put the stapler in a nice glass case and admire it while you sip your snooty drink, then by all means go right ahead you impractical, ineffectual loser. God I hate you.

Another option is to solder them on. It isn't easy and you're going to have solder showing. It'll only work with metal staplers and the hold isn't spectacular. Since it's nearly impossible to have a molten glob of solder into which you'd plop a nice spike. This is tricky, tedious and ugly. Unless you're a soldering god, you'd be better off with glue.

The best way to go is to drill a hole and screw in a spike. Obviously you don't want to drill through something that moves, or in a place where it would cause a snag, like by the spring. You'll also want to consider the curve of the stapler too, spikes have flat bases. You can pull out a dremel or something and try to slope the spike too, but that's too hard for me to try.
What all this means is that you might have to take the stapler apart. All staplers are different so I can't offer you specific advise, so here are some general guidelines.
There's usually a lil bar that the stapler swings open on, if you take it to Home Depot or something like it they can find the side for you. Once you know the size you can get a replacement in case you can't get it back on. Make sure you can replace it with the exact same size before you take it apart. The slightest wobble will cause you to staple at a bad angle and will eventually break the stapler.

Before you drill you have to "tap" the spot first. Tap means pound a hard, sharp, pointy thing into it as hard as you @#$%ing can. It's not easy to do this straight. One way to make it easier is to put duct tape on there first. The duct tape does two nice things; it provides extra friction so your nail doesn't go flying around when you try to pound it into steel and, if you put it on straight, gives you a nice straight point of reference line.
The tapping might bend the stapler a bit. If you can, stuffing a big stack of paper in there will help it keep its shape, but cutting it to size is a pain. If it gets bent, see how it fits before you try to fix it. Chances are that it'll be fine. Bending a stapler back into shape isn't easy. Think a lot before you do anything.

Use a metal boring bit for drilling and let the drill do the work. Drill bits are cheap, if you have to get a new one just do it. If your drill is skidding around the surface you didn't tap it good enough. Don't try to go through the metal fast, if you've got time to @#$% around with this you've got a couple extra minutes to spare. When you get through, you can wobble the bit around to widen the hole and smooth out the edges. Be careful, all the byproducts of drilling metal are dangerous and pointy.




This information is to be considered my notes to myself. Don't try this at home kids, you'll poke your eye out.