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Haha, you loosen both backwards, towards the back of the bike. I have to learn stuff like that because working on bikes makes me rage so if I got it wrong I'd end up just hammering the cranks off with a cold chisel and jumping on the frame to teach it a lesson.
I'm sure half the people dissing pro power numbers see 400W on their headunit for 10s and think "yeah, I can hit pro numbers, i'm a legend".
If you remember this and aren't just looking up pcs then I wonder what you're not remembering?