Use "tappet" in a sentence

1. Or rather we lived together, Grandma, Agatha-Agamemnon-Abigail, Timothy, and I, Tom, and Father, and Grandma calling us to frolic in great fountains of Latin and Spanish and French, in great seaborne gouts of poetry like Moby Dick sprinkling the deeps with his Versailles jet somehow lost in calms and found in storms; Grandma a constant, a clock, a pendulum, a face to tell all time by at noon, or in the middle of sick nights when, raving with fever, we saw her forever by our beds, never gone, never away, always waiting, always speaking kind words, her cool hand icing our hot brows, the tappet of her uplifted forefinger unsprung to let a twine of cold mountain water touch our flannel tongues