I suppose that being both a model engineer and a certified tool aficionado means I bring a sort of quirky combination of unusual information to the forum. That plus having been at this for 75 years and having a father who lived through the depression and the war and had to make what he needed; he passed a lot of his knowledge and DIY enthusiasm on to me.
Flexible drivers are also very handy with miniature equipment. This set...
which I own, contains one as well as the hard-to-find miniature hex sockets in sizes M2.5,M3.0,M3.5,M4.0,M4.5,M5.0,M5.5, There's even triangular screwdriver bits (haven't found a use for them yet) and some bits that look a bit like hex bits but have only t five sides (probably some alien spacecraft standard). Miniature pozidrive bits are hard to find and, if memory serves, it has those too. Regardless, highly recommended if you are forced to deal with the small side of the universe.