The two of you had designed this test article with accessibility in mind, and doing all the electrical work while it was fully assembled had been the plan from the beginning. It had been years since you needed to solder anything, so you had to reacquaint yourself with best practices, on top of getting the hang of a handmade iron. You only burnt yourself twice! Twilight continued to prove useful, able to hold wires to parts, either at any angle needed, while you worked with your iron and solder.