So you have suffered at the hands of French designers then........... 400 tools on the list, and all marked "Tool, Special". This included a spanner with a bend to get at a certain bolt, a hex key with an extra long shaft and a screwdriver with a narrow tip. One set was a whole pile of stainless steel plates, with board sockets bolted to them, used to align the pin sockets on the backplane. Not that fixing a pin on the backplane was easy, all were wire wrap sockets, and all were wired in white. Luckily you could brute force the pin out without breaking the socket, and break a shell to get a pin as a replacement. No way was I going to unwrap 100 pins after unsoldering them then rewrap them again. Luckily I only replaced one..... The test board was worse, they must have looked hard to find such unreliable a socket as they could, and then used it for everything, including resistors and supply decoupling capacitors. In the end I soldered most of the IC's to the sockets to keep from having intermittent faults. Only one that got a new socket soldered to the old one was a fusible link prom that was hard to program, not having any other method than using a breadboard and wire links along with filament displays to read the data afterwards. We had plenty of blank ones though........ and more than plenty of dead ones.