Nobody is mechanically challenged. I don't buy that for a minute. They're just fraidy cats. If I can do it, anybody can do it.
And I hardly ever foul up the job. I don't get it fixed 100% of the time, but at least I button it back up leaving no clue I was ever in it. It's either a bad battery wire, or the switch has gone bad. One time I found where the manufacturer of a Gossen got the circuit board a little off position and it cause an itermittent that nearly drove me bonkers before I discovered. But just going slap dead is the easiest thing to find.
If I can do it, anybody can.

If I can do it, anybody can.