The grub screw uses a 1.25mm hex wrench. It would be nice if RC Timer included one. They don't, so be sure and have one ready.
Note that we were doing the power wrong! Don't use a 5V servo connection, use a 2S-4S battery. Be sure and watch the polarity. It may not be a bad idea to put a battery connector onto the board.
Just for fun, I made a time lapse of the construction.
To be continued... configuration, software, and tuning