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I wanted to maintain the roller bearings in the azimuth drive instead of Teflon pads. So I ordered a 24" diameter round groundboard kit from AstroSystems. When it arrived, I notices a "notch" in the edge of the groundboard. As the azimuth drive wheel of the ServoCAT travels along the edge of the groundboard, this "notch" would create problems. I filled it in with wood putty and sanded it smooth. No tracking problems have been experienced.