Using this Grass Valley T2 Classic digital disk recorder is easy. First, make sure to connect it to the correct power supply that comes with it. When using the external hard - drive slot, be aware that the plastic door is broken, so handle it carefully to avoid any further damage. Regarding the sticky shuttle knob, you can clean it gently with a soft, dry cloth. For maintenance, keep the recorder in a clean and dry place, away from dust and moisture. Check the power supply regularly to ensure it's working properly. Also, don't use excessive force on the shuttle knob as it's already sticky. This way, you can get the most out of your digital disk recorder.