Especially when taking stuff apart, you often come across screws that you just don't have the right driver for at hand. You could always borrow/buy/order a proper tool somewhere, but that takes time and possibly money. When those two are not available in sufficient quantities (or you're just impatient/bored/like to make stuff), then you might consider crafting the necessary tool yourself. In this Instructable, I demonstrate how to make a #6 Torx and a 1.3mm Allen key from wire, using just a triangular file.
Step 1: The Set-Up
The need first arose when a friend called me up late one evening in dire need of a 5 point Torx screwdriver. He'd had a bit of a beverage related incident with his Macbook Pro (Unibody, aka no removable parts). To prevent further damage, he wanted to unplug the battery and remove the mainboard to check for spillage there. Now you can easily remove the back plate of the Macbook with a Phillips driver, everything inside is held in place by the battery, which in turn is fastened by the aforementioned odd-toed Torx. Now I didn't have such a tool either, but still grabbed some tools and went over there to A) try kludging it, B) gloat about him having purchased this utterly unservicable machine, and C) hold his hand if anything goes wrong.
Now I had thought the easiest would be to just make a fitting flat-head driver and try that, but it didn't work. In the end it was quickest to just make a complete 5-wing Torx.
I didn't take pictures back then, and the original remained with my friend, so I wanted to see if that was just dumb luck, or if the result could be recreated. I got some gadgets from a Flea market today, among which an Ipaq with dead battery, and a bluetooth gps dongle. These have some screws which are slightly smaller than the smallest bits I've got in my toolbox, so I gave it a try. So
(BTW, the camera is from the same flea market, so I'm trying that out at the same time... Excuse the image quality.)