Very, very true. Myself and a colleague had cause to visit a certain engine manufacturer. "Ah, that job will require 'Special Tool - ABC987 at a cost of £££££'s". "Hmmmm ..." says my oppo "... can we have a look at one?" It turned out to be a generic type spanner that had been heated up and bent in the middle. But, once the drawing had been made, the Part No applied for, item engraved, packaged, entered into the A.P., etc., etc., etc. the whole thing cost a fortune. "I think Station Workshops can make ours for us".