Oh and wasn't there the story of the IBM daisy wheel printer (if you remember those) which ran at about 10 characters per second. By paying a huge fee to IBM the printer could be upgraded so that the print rate could be doubled. The fee was paid, the IBM engineer turned up and was instructed to ensure that nobody else was to be present in the room when he carried out the upgrade. When this condition was met, he removed a cover, moved a drive belt to the other step of a pair of stepped pullys, replaced the cover and bingo - print rate doubled!
P.P.