Quote Originally Posted by Simon Barden View Post
If the harness is all soldered, then you do realise that you'll have to unsolder the barrel jack to fit it? .....
I don't know why I didn't think of this sooner. I've used this product numerous times for my other hobby - motorcycling. They are extremely easy to use and work like a charm. I think they'd be perfect for this situation.

https://www.posi-products.com/posilock.html
I'm guessing that the harness wires are in the 18-24 gauge, correct?