I looked all over the internet, and you cannot buy a screwdriver with a head like this. (I KNOW everyone and his brother will correct me on this, and post nine links to sites where you can buy a bucket 'o these for two dollars. So, you cannot easily buy a screwdriver with a head like this.)
As our good friends at MAKE say, If you can't open it, you don't own it.
While primarily found on little toys from fast food restauraunts (not just McDonalds), I've found these little screws on other small figures with leds inside them. This should work with those, too.
Step 1: Gather materials
- Old screwdriver
- Bench grinder
For mine, I opted to go with regular two-penny nails instead of an old screwdriver. Cheap, plentiful, and no big deal if I mess up. I recommend you make one with a nail before you put the grinder to your screwdriver, to get the hang of using the grinder if you're not used to it, and to make sure you know how to shape it properly.
If you don't have an angle grinder, you could use wet concrete, a la Tim Anderson's hunting knife. It might take a year or three to do it that way though.