Macos, ios, google docs, and microsoft word will autocorrect two hyphens to an em dash, which is how I normally type it. On a mac you can also type an em dash with option-shift-hyphen.
Really cool! I split my time between cello and software so I'm decently familiar with this line of work. What inspired you to switch careers? I imagine it's not easy to get a foothold as a luthier either. Do you feel like you're taking a big risk?