I think your right it comes down to torque and I think the torque is what gives you that initial puncture easier when I ran my capo next to my spektra the motors sounded different forsure even though they are both Swiss the bishop did sound slower or maybe softer and the spektra a bit more zippy maybe this is why machines like the rotary works etc line better even with zero give because the torque allows you to pop through the skin easier and get that initial puncture I was talking about without slowing down at the start I find I can line fast with any rotary but I have to slow down for the initial puncture on the line maybe a 6volt motor or something that runs with a lot more torque would help I have a cranker on the way we will see thanks for the input man I by no means think I know everything but I use rotarys everyday and am constantly trying to figure out what makes them tick and what techniques make them more efficient