The librarian has all the information 'at his fingertips'.
He tapped on the tabletop with his 'fingertips'.
He is a gentleman 'to his fingertips'.
(..) have loved every minute of it. That's fine, Stella. Now, would you fix me a sandwich, please? Yes, I will. And I'll spread a little common sense on the bread. Lisa's loaded to her fingertips with love for you. I got two words of advice for you! marry her. She pay you much? Oh. (..)1954 Rear Window