Here is a Morin Khuur instrument (2 string fiddle) from Mongolia.
When I took a look at the soft wood peg there was a small lip that did not allow the peg to go into the peg box. I adjusted that and the peg worked as expected. Even with the peg working correctly, you could not tune it up to pitch. Since Irina had an extra set of strings, I suggested that she remove a couple strans of the string and try tuning again. Then repeat the process until the string can get tuned up to pitch and that it sounds good.