I wasn't satisfied with spring strength after I moved pivot to second hole on brale pedal. The fact I couldn't tweak its strength was frustrating because predal travel was about 35mm with my custom 23mm metal cylinder. And the spring just compresses to its maximum so no room to make it feel lighter. Potentiometer isn't very helpful either. I could use RC damper but have no experience with it so it would be hit or miss with spring strength and oil viscosity. I also don't like the fact that any usual RC damper is aluminium-plastic and not sure how long it would last. So I came to this temporary solution that allows me to change spring without disassembling pedals. Pedal travel is about 40mm now and pedal strength is tweakable.