Because of the forms I have a tendency to make for my chess set & hollow forms, it's always the first book I turn to if I need help with techniques. However, with the scoring question, I didn't even think to look in it! But there it is, on page 14 "Scraping a Groove" how to make a scraping/scoring tool.
It's a simple process of heating an old file (which I do not have unfortunately), bending the tang at 90°, quenching and then filing & sanding the end into the desired angle, which for my purposes is about 45°. I just need to get some hardened steel and a handle...oh yeah and do a process I haven't done since week one of jewellery and metalsmithing. Not scared about that at all given my temperamental torch and shaky hands.
Tim McCreight's, Boxes and Lockets: Metalsmithing Techniques, is one of the best books I've found, and I really do go back to it time and again. Which is why I stumbled upon this today. I wholeheartedly recommend going out and buying it. It's available from Amazon for about £20.