[john70t]

Good idea with the reminder.

The double-check thing happened with my first bike back in high school. I had just gotten it back from a shop for a $250 valve adjustment, and it suddenly stopped running while riding on a slow road.
After spending an afternoon pushing it up and down hills several miles(Honda 750 with full Vetter fairing and full gas tank), I decided to take a look. Didn't know squat about mechanics, but ventured enough to take off the inspection caps and saw the adjusting nut missing.

My father helped with the second phone call.
The shop was (cough) very resistant to fix their mistake, and promised to bill me for all associated costs if, and when, they determined it was not their fault.
There was no apology for potentially causing a fatal accident.

That was one of the biggest inspirations in life in learning how to just change oil. A (worthless)ASE master mechanics certification eventually followed.
Heck, if someone was going to screw it up it would be me. The labor saved probably equals a garage full of tools and a mountain of parts.