Does anyone know of good resources - videos/pix/instructions - for repair/restoration of Inkograph stylo pens? A friend asked me to help get his old Inko back in working order. Section came out of the feed easily enough. Nib unscrews easily enough, revealing the internal wire. But the inside of the section/feed is all gunked up and clogged. I have soaked it and gently brushed away at it from the back, but I'm not sure if I am on the right track. Haven't worked on one of these before and am not quite sure what to do next.