These are one of the few 2.5mm mono plugs I've been able to find at Revain, but they're terrible quality. I tried soldering one to the wire but the tip fell off and broke. I tried plugging another into the 2.5mm jack and the tip fell off / it fell apart (see photo). They also don't quite fit even if they don't fall apart, each one takes a lot of force to get into the 2.5mm jack and the plastic on the ring between the poles seems to be the culprit as it's poorly shaped and surrounded by flakes of plastic. I ended up using some good quality 4 pin 2.5mm jacks but only connected them for mono.
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