I guess I need an advice here. I have made just a few sayas so far - from birch and Lime wood - both very nice, clean with straight grain. I am doing the sayas with friction fit and keep getting scratches from finished sayas. I am pretty sure that this is not the wood itself, but some particles that get embedded in the wood. I shape and finish the sayas with combination of belt saw, belt grinder and hand sanding and most likely I get some grains from the sanding paper or belt finding their way inside. Now I can imagine some solutions, but I would love to hear how others are working around his issue. Thanks in advance for tips and advices.