Sometimes I wish there was a third category in the tennis equipment section called Tennis Systems. It would be focused on the total effect of frame and strings. Frames and strings certainly play differently within thier respective categories but there are a lot of ways to skin a cat. The more I learn about tennis hardware the more interested I become in how the total tennis system of frame, strings, and other components combine to provide a certain playing experience. Spin generation and comfort is an excellent example... The most important factor in generating top spin or any kind of spin is technique. Brush the ball correctly and it spins. Hit flat and it doesn't. The faster you brush the ball the more spin you generate. And the greater the angle the more spin too. Which brings us to the topic of this thread. The faster you brush the ball the more energy you impart, even at steep angles. So even with good rotational speed the ball might fly long if the total tennis system of string and frame imparts too much energy on the forward vector. So many players seek lower power set ups ("systems") which allow one to "brush up" with great speed while limiting the forward momentum imparted to the ball. There are a number of ways to limit power on the forward vector. One is to use lower power polys, especially in spin friendly (yet higher power) open string bed patterns. Another that I've been using is a low power dense string bed and softer frame with a spin friendly gut-based hybrid (but gut tends to be higher powered). Assuming sound technique, rapid brushing speed, and good angle, in your opinion which is the best total system approach for spin generation? Is the spin generated by an open pattern poly based system worth the potential arm health issues? Can dense yet soft systems composed of 18x20 string beds in soft frames using gut/poly hybrids compete? In other words, what's your total system design of frame and strings for arm-friendly maximum spin potential? Factors to consider include string pattern, frame stiffness, frame weight and balance, string type, tension, etc. Another reason I'm interested in this topic is the emergence of ever more arm friendly co-polys. Again, taking a total system approach, might there come a day when systems using large frames with open patterns and advanced co-polys allow insane spin potential while being as arm friendly as gut? Could they be soft enough for use in dense patterns for the ultimate combination of control and spin? Or will control, comfort, and spin potential always be at odds and subject to horse trading?