After I pick what piece I want for the inlay, I drill it and glue the tube. I center it as best as I can. Then I put it on the lathe and round it out and square the ends with a parting tool. When I cut the wood, I measure each end of the tube showing on the top and match the pattern up all the way down. I use 3 ply guitar pic for the accent. If you want to see more pictures of the segmenting process and I can email them to you.