This is more of a theoretical question, if anything. Is there a limit of how light of a hammer you can have before efficiency drops off? I know I have heard of people getting over 60 shots with certain hammer/ spring setups, but is that REALLY the best you can get? What if you could make a nelson hammer out of composite, hell, even carbon fiber. would your efficiency go through the roof? I was also wondering which plays the greatest role in efficiency, the tension of the valve spring, or the weight of the hammer. The tighter the ID of the powertube, the better, correct? This is all theoretical, I am just curios to see if anyone has done any real testing with results in this area.