He's a 'mechanical' genius. [=he is a person who is very smart about machines]
He's not 'mechanically' inclined. [=he is not knowledgeable about machinery]
The flight was delayed because of 'mechanical' problems/difficulties.
(..) to hold you ? ? Feel my arms around you... ? Do you have a pen in your room? ? ...How long I have waited... ? (rhythmic mechanical thumping) ? You've got the look of love ? ? It's on your face ? ? A look that time can't erase...? Shh. (..)2002 Catch Me If You Can