I'm in the process of making my first fully custom knife. The blade is fixed full tang, and I've made some micarta scales for it, but I've run into a problem. The blade handle is perfectly flat on both sides, and the micarta scales have been sanded flat on the side where they meet the metal, but when I screw the scales on they don't fit perfectly flush. I wanted to know, are there any spacer materials that compress at all, so I can make that sliver of a gap unnoticeable?