Wire Extension - Proper method

I am purchasing the dual rectifier upgrade and as part of that upgrade, I will need to do wire extension.  


Is there someone who can post maybe a "best practice on how to do this, to ensure clean and longer life.

I believe the wire is all stranded, and so less complex.   In normal electrical work I would use wire nuts and similar product but .. no so in this case.

I saw image posted on thread for the dual rectifier upgrade that showed a slit of wire in line  which looked very clean / similar but looked like there was some kind of connector under the heatshrink.




I googled around to find a few examples

https://www.youtube.com/shorts/IcX0R106yQo


But wanted to see if community had comment.

That one is ok. I don’t think you need to hammer your solder and you should probably use a soldering iron. There are lots of good videos on this. Just make sure to put your heat shrink on before you make the connection.

I use the solder and heat shrink method when extending wires. Find the proper size heat shrink tubing and like New2Tubez says install the heat shrink tubing first then twist the wires together making the joint as round as possible, solder with a good 60/40 solder and then slide the heat shrink tubing over the joint and heat the tubing with a heat gun or butane torch.