Learn From Others Mistakes

Here are some mistakes that I have made.
Hopefully someone will be able to "Learn from others mistakes".

De-burring 13xx Air Tubes.
I forgot to remove the burrs from all the places they can hide. The result, nicked O-rings and pump cups.
Photo's courtesy of Gil
Here's a How to that Gil sent me.

13xx Role Pin Removal
Here's another "How To" that Gil made.
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