Buy the crank-upgrade box from Pioneer, put cranks in, post to Pioneer, they'll send you back a fully assembled DA9000 powermeter crank.
This thing: https://www.powermeter24.com/uk/pioneer-cyclo-power-meter-upgrade-kit-dura-ace-9000-drive-side-870
@hippy started
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Buy the crank-upgrade box from Pioneer, put cranks in, post to Pioneer, they'll send you back a fully assembled DA9000 powermeter crank.