Very last one in the world (I hope) I'll ever have to assemble

Yeh butt connectors, heat shrink. Even temporary tape. But you won't find stuff that fails, nor skotchloks or wire nuts LOL etc.

Frankly I've never been "pretty" on my own wiring. But I just make it WORK. The real VERY real problem for me is I've finally gotten old enough and damaged enough now, that crawling around to make stuff "perfect" is just not gonna happen. Getting involved with "boats" did not help LOL