I just built my first patchbox two weeks ago. I glued a paper pattern to my brass plate and rough cut close with a hack saw and used a small half round magicicut file to get almost there. Then finished up with needle files. It worked great, same way that Hershel house does in his video. IMO if you are just starting to build long rifles there are more important tools to get first. I may have a jewelers saw some day but it won't be until I have all the chisels, gravers, and more important tools first.