Received the 635.5mm two groove pulley today for the 7.94:1 ratio.... Here was the sunset from my apartment when I got home: I have a design that will fit within my frame that will allow 16 pendulums using 6" bar instead of 3" bar. Having an event every 22.5 degrees is going to make this a very interesting device. The bad news but at the same time good news is the pulley I have ordered only with allow a minimum of a 25mm bore taper lock bush. 25mm should be good for a lot more weight. I will go to titanium if I have to. I don't want to change the hubs on the flywheels as it will mean the flywheels will need machining. Luckily there is a taper lock bush in 25mm that fits my existing hubs! PMG and charge controller have left Springfield Missouri and are in "transit"...... Watch this space.... Nearly time to prove to myself if I'm deluded or not.... I already know what the vast majority of your opinions are.