I'm told that this part that I am thinking of is called a "Spring Clip " ......I have needed these clips from time to time and can NEVER find them anywhere .......Can anyone point me in the right direction ? ......They are the little clips with 2 little balls on them that you push in when you want to adjust your shaft to go longer or shorter , and they pop into the next adjoining set of holes ......What are the called, and where can I find them ....I'm gonna get dozen of them so I have them on hand .....Thanks, Jim