Piano keys
Fonsini,
On the earlier marks of Lightning (1, 2/2A & 4) reheat was selected by pushing the throttles through a detent instead of 'rocking outboard'. A latch then sprung up behind each throttle to prevent accidental cancellation of said reheat. These were the 'piano keys'. All well and good but it did mean that you had to depress these latches with your thumb as you pulled the throttles back. Just retarding the throttles reduced RPM by c. 10% but maintained min reheat. Taffy Holden was unaware of this function. Although it did require a mild degree of manual dexterity it quickly became second nature. The later marks (3,5 & 6) had fully variable reheat with the more instinctive 'rocking outboard' This instinct did however have to be curbed when converting to the Tornados where rocking outboard selected reverse thrust - a very different outcome.