A bit like telecomms. I used to drive around in my little van taking people's telephones to bits to fix them. Then someone had the bright idea of plugging them into a socket and sending a new one out in the post.
Can't beat restrapping a 746 to get it to work as a Plan 107 extension. Or, in the middle of Martins Newsagents, crawling around the floor looking for all the springs and contacts that had shot everywhere after I popped the top of an HES4
Martins Newsagents? I'm talking about going missing for two days in United Biscuits, or Plesseys, try to figure out which way some twonk had routed the wiring for an extension on the PABX. I've been known to go 'deep cover' for almost a week.
Switchboard operators liked nothing better than groping the young lad's bollix while he was crawling around their feet. Made me go quite red sometimes.