All should remember-- The techn. books are there, purely as a guide . Their purpose for being, was to bring a commonality to teaching.

As scrivener remarked -- there can not be any exact technique ( paraphrase )

in essence, meaning some techn. may change , to suit a circumstance .
He also remarked about f/t- " you can be off the " slows "-- but only a fool would be off the Quicks "