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I’ve seen this on AliExpress (but don’t have it myself) 3rd picture appears to show it fitted to a Brompton.
https://vi.aliexpress.com/item/1005005957208012.html?spm=a2g0o.detail.pcDetailBottomMoreOtherSeller.14.4f25LmZJLmZJfe&gps-id=pcDetailBottomMoreOtherSeller&scm=1007.40050.354490.0&scm_id=1007.40050.354490.0&scm-url=1007.40050.354490.0&pvid=a9e657e2-52e6-462b-82c1-57e9b91d8b4b&_t=gps-id%3ApcDetailBottomMoreOtherSeller%2Cscm-url%3A1007.40050.354490.0%2Cpvid%3Aa9e657e2-52e6-462b-82c1-57e9b91d8b4b%2Ctpp_buckets%3A668%232846%238114%231999&pdp_npi=4%40dis%21GBP%2119.95%2115.56%21%21%2125.16%2119.62%21%402103872a17241768135707541eed02%2112000035031018626%21rec%21UK%21%21ABXZ&utparam-url=scene%3ApcDetailBottomMoreOtherSeller%7Cquery_from%3A&gatewayAdapt=glo2vnm
@grams thanks for the insight.
@HoKe I’ve got a Dynamo light so cable to rear light wound round the seatpost, going up and down wouldn’t be the nicest way of having it wired.