Hello, I was gifted an older model Zenith Elite model number ZR300040.680/01. I don’t know an awful lot about the watch, but have been wearing it for the past 6 months or so. Today I somehow managed to have the caseback pop off. It was an audible popping sound, which was pretty startling to hear coming from this nice watch. My problem is that now I cannot seem to get the caseback on the watch again. I know sometimes the casebacks require a lot of pressure to put back on, but I’ve put quite a bit on it and it doesn’t even seem like it’s catching anything at all that would suggest it getting back into place. Doesn’t seem to screw back on either. I’ve attached pictures. Anyone familiar with this model and the caseback? Have recommendations or can help me get it back on?