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Not on the doepfer power cable!
This is on the Belton Brick (aka "brick") itself where it connects to the pcb.

I just soldered it onto the pins on the opposite side of the pcb to the brick.

here's an example for the component in case that helps (select 10uF, last on the list)
Xb4AAOSw9kZkT4GG&itmprp=enc%3AAQAJAAAA4LomZ%2BJFE00C9rwdY6Q1HI5xmjj1w1SbCMyW%2FtWR3Mq%2Fwwu1DfplrK3rnuSog2u71BVh5dVHhTBOlvz52tQMTAZqfrQ7sqrzP915hFELsZGZ%2BKXwdsjBbjfwcmHcQyf0tjtytJ0iyzuKf1AhhL0FmZaO92MagaTA7HRD1r0ed%2BephdRkgAP07ckOWzU04moBFFUPtpQ0nu0GQPuKXJVwFkuIq1O7k7NzaUAlZL3mUNuqt7ChqyWyzZ%2BObOhp3W9ytWqnV2FQhxMoAf%2BT63V66vkcG0hSuorOO7IQFpbWQQ%2Fq%7Ctkp%3ABFBMypvq6-Bj" target="_blank">https://www.ebay.co.uk/itm/314468956340?itmmeta=01HW3BTHPGC6P0A29NA3S80AF0&hash=item4937cf78b4Xb4AAOSw9kZkT4GG&itmprp=enc%3AAQAJAAAA4LomZ%2BJFE00C9rwdY6Q1HI5xmjj1w1SbCMyW%2FtWR3Mq%2Fwwu1DfplrK3rnuSog2u71BVh5dVHhTBOlvz52tQMTAZqfrQ7sqrzP915hFELsZGZ%2BKXwdsjBbjfwcmHcQyf0tjtytJ0iyzuKf1AhhL0FmZaO92MagaTA7HRD1r0ed%2BephdRkgAP07ckOWzU04moBFFUPtpQ0nu0GQPuKXJVwFkuIq1O7k7NzaUAlZL3mUNuqt7ChqyWyzZ%2BObOhp3W9ytWqnV2FQhxMoAf%2BT63V66vkcG0hSuorOO7IQFpbWQQ%2Fq%7Ctkp%3ABFBMypvq6-Bj