That is a nicely made harness. Regarding the jack sockets, I've taken to using theseView attachment 31923
Switchcraft Dual Tip Contact item. Typical Switchcraft quality & the dual tip contacts make for a very positive contact. Adrian, regarding your dislike of soldering, may I ask, what type solder are you using? If your using the "lead free" stuff, I fully understand. I hate the stuff due to its inability to "take" to the job well unless an electronics grade flux is used. If you are using this, I suggest getting hold of some quality "resin cored 60/40 (60% tin/40% lead) solder". This is all I use & no flux. So much easier to solder with & "takes" readily so long as the job surfaces are clean. Cheers
Versus irons?Avoid soldering guns, as their magnetic field can affect pickups...
Versus irons?
Agreed. Lead paint tasted better too if I remember correctly from the 70s.The lead /tin solder smells better also.
Yes. The guns employ electro-magnetic coils for faster heat. I've read they can de-gauss a magnet very quickly.
If your using the "lead free" stuff, I fully understand. I hate the stuff due to its inability to "take" to the job well unless an electronics grade flux is used.

I almost hurt myself laughing.A good joint is dependent on the parts being very clean and using a good flux.
I almost hurt myself laughing.
Hmmm...
I’ve used a soldering gun before on my guitars with no ill effects. That was before I got a soldering iron.
I certainly understand the theory. But, this strikes me as the same type of warning that cautions against leaning your guitar against your amp for fear the speaker magnet will degauss your pickup magnet.
Don’t get me wrong, Robert. I’m not criticizing you. I realize you’re just passing on a warning you’ve read. That’s kind and considerate of you.
But, I’m skeptical of the idea.