I don't know if they'd actually come apart but I shot one down the driveway once at about a hundred miles per hour .
Had the clutch off a Mac and like a dummy fired it back up without a bar and chain .Kind of unscrewed itself when I left off the gas .I found it though .
Had the string gizmo come off a weed wacker once too .As far as I know it might be in Canada .Last I saw it was heading north at about 100 miles per hour .