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The other good time to double clutch is for a missed upshift. Consider what happens when you wait too long upshifting between gears. The input side slows down too much. Now the syncros are doing work to bring the input side back up to speed.
It's easy to miss 1-2 first thing in the morning when the transmission fluid is cold and thick. It's also easiest to practice timing in the morning.
Start out in first. Push in the clutch and pause for a sec before disengaging first. Notice how you have to tug? You're working against all the gears squeezing & shearing that thick shit.
If you time it right and begin tugging just as you've disengaged the clutch, it slips out of gear with a tiny flick. If you do that flick and immediately put a tiny bit of steady pressure on the slip ring, it'll flop right into second every time.
But if you miss, let go. Double clutch to spin up the input side again like you're rev matching for first, and try again. I've had some really cold mornings when third time is a charm. At no point do I ever have to lean on the gearshift.
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