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Ok flame away. Maybe definitions have changed but double clutching had been letting the clutch reengage while in NEUTRAL to spin the gears up to a matching rpm to engage in the lower gear. This required pushing the clutch down twice for each shift, hence the term double clutching. This was necessary in old transitions without synchromesh. They were fondly called crash boxes. As shifting up or down required gear speed matching. To day we use rev-matching to do the same thing. Simply pressing the accelerator with the clutch pressed before engaging the next gear will do the same in a modern trans. Rev matching is NOT double clutching.
While were at it, toe heal usually means blipping the throttle (or rev matching) while under breaking. Originally the pedals were far enough apart and required a large movement of the pedals so you put your heal on the brake and your toe on the gas, now the pedal spacing and the throw allows the use the sides of your foot. This is needed to down shift (usually on a track) where hard breaking and down shifting is need at the same time. Usually coming into a corner, it is seldom used on the street unless practicing for the track.
Why do I care and how do I know, first I am old and second I still run old cars like my 1932 MG-J2, it has a crash box, (no syncros) and third I still love my time on the track as an instructor and a driver.
This is only offered as a FYI.
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