My recapped Game Gear had a problem with scraping sound when adjusting the volume with the volume control. There is a relatively straight forward way to fix that: replacing the volume control wheel. To do so, you need some basic soldering skills and tools. The volume control is a 10KA (log) Potentiometer. My potentiometer was a bit slimmer than the original, but that is not a problem: it feels the same as the original. In the images below, I go through the process of replacing the volume wheel.