Most credits go to Shadowman, as he invented this lift first in his unfinished ball machine, I tried to rebuild it from the vid (only managed to rebuild the front part of the arm and some basic ideas).
So, this instruction is very complicated and nothing for absolutely beginners.
And it is also loooooooooong.
Be sure that all 3D connectors are turned correctly, with some you also have to pay attention that they aren't turned 180°, I'll note which in the image notes, so be sure to read them!
Sorry for any fails I made, making instructions was quite complicated.
And feel free to ask if you have any problems!
I use a plug-in motor, and I would recommend also using one as they have more power than the battery motors. Maybe you could use two battery motors...
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Oh, and the first one to make a piece count will earn a patch :D (But please be honest about it)
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Step 20: The arms
Step 24: Making the first counterweight
The string between the counterweight and the connections (without the used for the knots) is 1.43 meters (56.2992126 inch).
Step 25: Inserting the first counterweight
Step 27: Making the second counter weight
The string is 86 cm long (33.8582677 inch).