Custom post type single template not working

Hi,

i can’t find the right template name for my single custom post type. here’s the post type:

register_post_type('tehtud_tood',
  array(
    'labels' => array(
      'name' => 'Tehtud tööd',
      'singular_name' => 'Töö'
    ),
    'public' => true,
    'has_archive' => true,
    'rewrite' => array('slug' => 'tehtud', 'with_front' => false),
    'supports' => array('title','editor','thumbnail', 'page-attributes')
  )
);

i have tried

single-tehtud.php
single-tehtud_tood.php
archive-tehtud.php
archive-tehtud_tood.php

so pretty much everything. where did i go wrong?