pre edit, re big end increase in stiffness salesman prior comment
Ok, I spill the beans, steel alloys vary little in thier stiffness, modulus of elasticity and all
Yep, all steels are around 30Msi modulus. Aluminum is around 10Msi, Titanium around 15Msi. Beryllium is the best, stiffer than steel, lighter than aluminum, yield strength isn't all that great though.
I asked Warren Johnson back in the late 1980s about carbon fiber rods. He said they were too stiff and beat the bearings out. It looks like that design allows some cushion in the design. I thought Polyspheric was an engineer from his posts.
