This is a great collapsible hiking bow saw.
Made from a scrap 2x4 and some easy to find hardware.
An old-timer had one of these when I was little. After a little trial and error, here is my version.
Drawings I made are available at the address below.
app.sketchup.com/app?3dwid=006aa779-600c-4b3f-97e3-053f8c957863