Short of going to a jeweler or watchmaker, how can I open this case back below? It is for a small Lucerne watch from what I think is the 60s that I got off the bay. Am not sure if any of the attachments on my Jaxa opener would work. I tried using a rubbery friction ball opener and it took like 15 minutes of trying just to get the back to maybe do one turn. It is still attached. Any one familiar with this type of back? Thanks in advance.