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@TruffleShuffle
I tend to get it (not always though) when I'm the motorbike and driving a car. For me it's being in a static position with little blood flow going to the arms, the vibes no doubt contributing to it. Conversely, when I'm on the bicycle it's not a problem because I'm pumping the blood around.
Worth mentioning that if I have do up zips or press down metal buttons on my jackets, I suffer a lot of pain in my fingers and get a short-term numbing/soreness from this. Whether this is related to the Raynauds, or just that I have skinny fingers, I don't know.