http://astroshed.com/observatory/c11saga/c11saga.htm
great article about the same issue as yourself
Also this video is useful on how to remove the corrector plate so you can check the inside, don't worry about converting it to a hyperstar but it can give good clues on how to "tighten" things up
https://www.youtube.com/watch?v=GXA7X5G_Ml8