So it was 20.3kg for 7.4 bar somewhere at the begining of extraction (0:23 of the video) if I see correctly. And 22.3 kg for 9bar several seconds later. About 40-50% more force for the same pressure than I measured back then. However, I was holding the lever at the very end, maybe that's one of the reasons I measured less force needed, in addition of not having very good scale
Can you make one more video where we can see the angle of the lever and the force at the same time and post just a photo of the diagram at the end?