Broken plastic part on 2930 Alan 30 inch window spring

Your top plastic attachment resembles our 19-002. Look it over and see how it compares. It doesn't come with a rivet, but you can use our 62-005 to install it. See the video below for instructions how. Also keep in mind that when these nylon caps start to break, it could be a sign that the entire balance needs to be replaced. There is a chance that once you replace the 19-002, it will only break again not long from now.