I figured I could use uncolored mineral oil or red colored (these are the most common available on the market). I choose red with red LEDs because I found a cheap mixing mineral oil used for 2 strokes engines and I was content with this solution.

I managed to drill a hole in the jar using a glass drill bit, but I have to admit I also managed to break my first jar at a first attempt. So, I’m advising you to use thick gloves and goggles if you want to try it. I sealed the hole using glue gun first, but it started leaking after a while so I took it off and replaced the whole sealing with transparent silicone which seemed to have a better adhesion to glass.

Inside the jar I also placed a 6V sealed lead accumulator of 1.3Ah so this provides functionality for almost 12 hours in case the power goes down.

The custom letter LEDs are manually build also. I placed two overlapped pieces of transparent laser printed foil over the LEDs and then I covered the entire LED in contractible tube as the image shows.

The LEDs from the second are showing the word Jesus when they all light up at 31 seconds (or 0001 1111). I thought that, since the Christmas is coming, a religious message would be most appropriate. But you can choose whatever you like, if you want to re create this clock.

I think there is also room for improvement. For instance, I’m thinking of adding a constant temperature regulator to the oil (keeping the temperature higher than the room temperature, of course, but stabile). In this way, I could keep the master’s resonator at a constant temperature and obtain a very precise clock period (in theory).