The Losmandy Clutch Knob Upgrade by Explore Scientific is a must-have for any serious astronomer. This upgrade uses a precision-machined aluminum knob and stainless steel set screw for maximum stability and control. It allows for smooth and precise adjustments to your telescope's altitude and azimuth, making it easier to achieve the perfect alignment for any observing session. With this upgrade, you can be sure of a perfect alignment every time.