Ron Stone's post reminded me of something that I remember from flying.
Never use a lead pencil to draw lines or reference marks on aluminum.
The pencil lead will cause the aluminum to corrode and weaken the metal.
Several emergency landing were traced back to someone using a pencil to
marking a paint line on the prop tips. The tips separated in flight and
caused the engine to have to be shut down due to vibration.
This is not to say that Ron did this. It just reminded me of times I
stopped someone from marking the element with a pencil to show how far
in the elements are supposed to be inserted.
Sorry for the space just might help someone else later.
Steve
KD4WIW
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