An aluminium plate was machined with holes positioned at the location of every key on the keyboard and fixed to the laptop. A direct photocopy of the keyboard was made to give the hole positions. A plate of plastic would probably have broken between the keys since drilled hole separation was only about 2mm – so aluminium was chosen. A trial run was carried out and the holes were slightly increased in size to prevent finger jamming, and thus enable better contact. The keys could then be confidently pressed one at a time.
The client how happily uses the keyboard far more effectively than before – THANK YOU! shows on the screen in the photo.