I built an IN-14 Nixie tube clock kit many years ago and have since lost the instructions. Some controls I was able to figure out, but I haven't yet figured out how to set the clock. I'm sure it's associated with a few of the 5 buttons in one side of the clock, but my trial and error guesses haven't yielded fruitful resukts. Does anyone recognize the clock and possibly have a pointer to instructions? Thanks!