In this episode of the Mastering Rod Building Podcast, host Bill Falconer is joined by veteran custom rod builder and retired mechanical engineer Mick Danek. With 69 years of rod building experience and six patents from his automotive career, Danek brings a unique perspective to the science of blank performance.

The conversation focuses on True Natural Frequency (TNF)—a dynamic measurement of a rod’s recovery speed from deflection. Unlike the Common Sense System (CCS), which offers static measurements, TNF gives builders an objective method to evaluate rod performance and sensitivity. Bill and Mick explain how TNF can be measured at home with a smartphone app and explore related topics like flatline oscillation, stiffness-to-weight ratio, and how these factors influence casting accuracy and feel on the water.

Whether you’re an experienced builder or just getting started, this episode offers valuable insights into how engineering principles can elevate your custom rod designs.