I am finishing a large bowie with a large cross bar guard. It is a full tang. I have the guard finished and polished but not attached. I am stuck on how I will sand down and get a perfect fit of the scales to the tang without scratching up the guard where the scales but up against the guard. Any tricks? Sides are easy since I can sand down to brass flush and repolish. Top and bottom are my challenge. Appreciate any advice for a new maker.