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How bad do you want power... I got a Stages Rival arm for £210 during last years black Friday sales. You could stick one of those or the 4iiii [probably] on the S300 [https://www.bike24.com/p229035.html] which basically uses a rival arm.
spinnnout
@onyerbike
Heard back from 4iii: " The Omnium has a channeled back preventing it from supporting PRECISION."