[BerntR]

I believe it is written that Acc #4 is the master accumulator.

I don't agree that it's Accumulator #4 is the one that's least used. IMO it's the strongest and the most used one. I think Homer would have been more clear about that if he hadn't been blinded by his lever system which is totally unfit to model how the pivot produces power through the left arm. PP#4 is certainly the weakest pressure point but it aint pp#4 that makes Accumulator #4 fly.