Be Nice
You have to go about this in the correct way.
1. Be Nice when you locate the Mechanic.
2. In a soft friendly voice, ask him if in fact he was the professional Mechanic that had the opportunity to work on your precious "BigDog".
3. And when he says "YES" I was the one :
4. With a Huge Smile on your face, Look him right in his eyes and :
5. AND PUNCH THE SHIT OUT OF HIM. Knock his Friggen teeth out of his head.
(Sorry, My New Jersey is Showing:angry
Obviously he has no idea what he is doing. Thank goodness that YOU were the one that found that while in your garage, and not at 60 MPH.
Just my 2 Cents.
Ride Safe