I’ve acquired decent headphones!
They ship with a proprietary 2.5mm (with a lock to keep the cable from pulling out) to 1⁄4” cable, and I wanted to be able to use it with the more prevelent 3.5mm connectors, and particurarly to have a control fob (and mic, but that’s not so important) to use with my phone.
Thus, with the application of a far-too-large file:
a modified 2.5mm connector beside a stock Sennheiser 2. …