
Rather than paying a few quid on e-bay for the "gamebit" as they call them, I used a sanding tool on the dremel to grind down the side of the tool to make it slimmer (the space on the Nintendo cart between the screw and casing is very narrow) and a slim engraving type tool on the dremel to make the six grooves flat and not pointed - hey presto - I can remove the 2.5mm Nintendo screws from a cartridge no problem!
Pic of finished tool. 2 minutes work.

Works fine, just tried it. Cheap too - in my case, free, as I had them doing nothing at home when I bought the set of cheap screwdrivers for the others in the packet!
I thought this worth posting as it is a cheap alternative to removing Nintendo screws.
If this hadn't worked I thought of boring a hole in a piece of metal and fashioning it, but I don't need to.

