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Who knows how to double clutch?

Double-clutching is a driving technique solely used in manual transmission vehicles.

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ArishMell · 70-79, M
I do know "how" but do not need to, and would need a lot of practice to do it properly.

It was necessary for manual transmission vehicles until rendered obsolete many decades ago by the invention of the "Synchromesh" gearbox (I wonder if that was originally a brand name?), which aligns the gears without having to depress the clutch pedal more than once.

Ever since it has only been still needed on vintage vehicles, built before the invention.

It has never been necessary on anything I have driven - I think my oldest vehicle was made in about 1960, with 3-speed manual, column-change, synchromesh gearbox. (My present car, made in 2006 I think, has a 5-speed manual gearbox.)
bravo55 · 70-79, M
@ArishMell older Land Rovers
70’s were crash gears on first and second.
ArishMell · 70-79, M
@bravo55Thankyou! I did own two, both Series 2 I think, but I forget their years,

However a friend owned, and I occasionally drove, a late Series 1 or early Series 2 (certainly 1960s-built) and as far as I recall all three were fully synchromeshed.

Double-declutching might have been needed if driving in low-range but I don't think I ever did that more than a couple of times.

Not easy for me to drive though, as I am short and the seats were not adjustable.