Do you REALLY
think that Tony does not know to turn back the screw to find
the thread start???
Everybody that I have evr met who did NOT know to do that was under 30.
When I read it, I was waiting for something tricky like slipping
in a bit of tissue paper to tighten up the hole.
An old trick for moderately-sized self-tappers is a bit of insulation
stripped off some hookup wire and put down the hole first :-)
Harbor Freight
puts them on sale for $3, or even $2
They are worth that much.
Last flyer I saw, they were giving them away.
And that's probalby more than they're worth ;-)
-tony