Clois,
A few years ago (and I have been around for a while) I too finally learned that
when no matter what you try, it just doesn't work, you drop wrenches at the worst possible time, like when you are upside down buried under the dash,
the nut won't stay on your fingers when you try to start it -etc., then it is time
to get away from it all. I have gone back the next day to finish some impossible task that wasn't working one day and have everything work the
next day. Some times I think it is just the timing. Sure saves on the cuts.