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.
(..) The Mark torpedo launch system's nominal, but-- there's a wrinkle. It wasn't designed for a biological target. It needs something mechanical... or electrical. We need to tag the Meg with this. It'll send out a signal to the torpedo. (..)2002 Shark Attack 3: Megalodon