This part brought back memories of a place where I worked where the engineers were forbidden to touch any part of the xerox machine except for the operating controls. If it jammed we had to get a secretary or clerk to fix it. Seems that if they let the engineers open the machine they'd end up with the machine disassembled and an even larger repair bill!
Now, as far as CDing goes, my engineering logic just can't grasp it. There's no discernable pattern or functional procedure to get hold of so I just set that part of my personality aside and let the rest of me enjoy myself.