Using your Cobb 5 - speed weighted shift knob is straightforward. First, refer to the included installation guide to install it on your Subaru's shifter. It's designed for an easy fit, so you won't need any special tools. During use, the weighted design will give you a smooth and satisfying shifting feel. Just grab the knob and shift as you normally would. When it comes to maintenance, you can clean the Delrin upper section with a mild soap and water solution. For the stainless - steel insert, use a metal cleaner to keep it looking shiny. Make sure to check the tightness of the knob periodically, especially after long drives or intense gear - changing sessions. If you notice any looseness, simply tighten it as needed. Also, avoid using harsh chemicals on the knob as they may damage the finish.