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I want to remove the rear wheel in order to replace the tire and tube.

How to detach the chain-tension cable on this old-school 3-speed Brompton? Does that black losenge-shaped thingie that is attached to small chain going into the rear hub simply get twisted off the threaded connector? Is that shiny clip somehow involved?

When I attempt to unthread the plastic piece from the threaded connector at the end of the hub chain, the chain-tension cable itself begins to untwist into separate strands.

Old school 3-speed Brompton rear wheel

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    That is an SRAM Spectro hub and adjuster. I can't find specifics on how to manipulate it, but this page has some info. Nov 8 '20 at 16:56
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    I think you have to press the shiny clip on the bottom right and then pull the threaded connector out. The threads are used to adjust the tension (similar to a barrel adjuster).
    – Erlkoenig
    Nov 8 '20 at 21:00
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Just press the metal clip and you can simply pull them apart (with very little force). Tipp: attach some tape to where the plastic part engages the threaded rod so you don't have to readjust the shifting when reassembling.

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