What does that mean?
I have a feeling that there's a
generation or two who have no idea.
Decades ago bills, receipts and other important
papers were organized by being stuck onto a spindle.
Many were free standing - this one hung on a wall.
Early computers relied on punched cards with
a series of uniform holes for input & output of data.
A raggedy, misplaced hole would
muck up the whole operation.
IBM began printing the phrase
"Do not fold spindle or mutilate"
on the cards.
And that's the origin of the phrase.
Have a lovely weekend!