The final steps were:
- desolder the floating wire on the LED+
- desolder the GND wire, cut it to the same length as the + wire, resolder
- cut wires to go from LED1 to LED2
- solder LED1+ to LED2+ and LED1- to LED1-
- uncscrew the Piezo, drill the holes to expand, and refasten
- use tack to fix the backpack on the Trinket
- place the switch in it's holder
- mount the Trinket (this was not great--the screw head strips, but I got enough in to hold it)
- close it up (this was hard, because there's a lot of stuff in there and the cover still does not fit perfectly, but I got it)
- It says that the LEDs should be connected in series when only a parallel connection works
- There is no mention of the battery--where to position it, etc--the answer apparently is "stuff it in any way you can."
- The wiring diagram shows all wires coming out of the top of the Trinket. Some must come out of the bottom. There is no mention of that in the text.
- The stuff about tolerances for 3D printing was not obvious (to me which is OK because I don't know anything, but it was also not clear to the 3D printing service I used)
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