Vintage Bird Automaton (Music Box Music Works Edelweiss)

Windup music box, so charming, plays Edelweiss from Sound of Music. About 7" tall. Bird should sway, tries but does not. You can tell something is stuck or needs cleaning. Above my expertise. It seems to be so close to working. If I push the swing to the back and play the music by winding it does swing slowly forward, then quivers a little but does not move further. So close! Brass is in used condition. Cleaned as best I could as this was on a shelf somewhere collecting dust, lol.