Try this coil drill to increase clubhead speed In the video above, Novak shares how easy this coil drill can be. All it takes is two clubs and some space to maneuver, making sure you fully rotate ...

Depending on the intended use and the spring and cam-lobe design, coil-bind safety margins can now vary from 0.015 to 0.120 inch, with tighter numbers predominating on very stiff valvetrains.