[Looking for advice] Searching for a small slim twistable connector

https://pawb.social/post/31648306

Some 3:1 glue lined heat shrink on the backs of each connector might do the job.

The glue melts during heating and with a 3:1 ratio you get quite a bit of glue forced in around the wires as it shrinks. It then sets pretty robustly once you get down towards room temperature.

You could try shrinking maybe some 6 or 10mm heatshrink over approx 25-50mm either side of the connector (with a bit of overlap on the connector) and see how it goes. Fully shrunk it’s pretty chunky but it won’t be any bigger than the connector.

Glue lined heatshrink is sometimes called dual wall.

That could work. I need to find a way to more precisely inject the hot glue at the shrink tubing (shouldn’t be rocket science).

I actually did exactly that, but at the 5v to 12v step up module where all the 4 wire pairs leave the module. The step up module for the fans is basically rock solid and that works flawlessly.

As an alternative to hot glue, shoo goo can be thinned down with tolulene. Robrenz did a video on it but I couldn’t find it.
Check out his videos on the ultimate Kelvin connection or triaxial test leads, they are next level.