All very true. I can only add that a surprisingly small amount of wear can
cause a lot of problems.

Boy, isn't that the truth? I'll bet I've replaced every screw on my
plane in the five years I've owned it.

I replaced all the structural screws around the gas tank with
stainless steel screws when I pulled the tanks to comply with the
dreaded "Service Bulletin 1006" -- the wing spar corrosion SB that
every Cherokee owner fears.

And I've replaced every inspection panel screw, too. Every year I
plan on replacing at least 25% of them. Even so, there's usually one
or two boogers that require "special treatment" to get them out.

I would love to replace them with square-drive screws. THAT would be
a huge improvement.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"