A hammer. Usually used on delicate devices when a real screwdriver would be better. Refers to the habit of a Birmingham inhabitant (i.e. simpleton] to take a rather simplitic view of maintenance. Similar to percussive maintenance
If it don't work - hit it.
If it still don't work, use a bigger hammer.
Ay, Jimmeh, pass uz tha' Birmingham Screwdriver - oi can't geh this new graphics card in this bastard compu'er wivaht a slight modifahcation
There, snug as yo' mum