I now have 2 Jacobs Super Chucks that seem to bind when opening the jaws about 3/4 of the way to fully open by hand. Can get the chuck to fully open but it’s clearly binding. With the key it’s no big deal to fully open. One is a 14n and the other is an 18n. Both are USA made and older. I don’t have an arbor press to separate the chucks. When this happens, what is the likely cause? Thanks in advance for the help.