I've recently purchased my first 6309 cushion case diver. The only thing needed to tidy it up was to replace the aftermarket bezel insert with something of better quality from Harold. When the bezel was put back on the insert seemed to be raised at 6 o'clock, bezel on and off a few times, insert in and out a few times, and a good few pushes on the crystal retaining ring and I'm still at square one.
Sometimes the center cutout on the insert is too small in diameter and will catch on the bevel of the crystal, especially on aftermarket one. Pull the bezel off and flush the insert up and if it fits with the bezel off then the problem is the inner diameter. If it is raised with the bezel off then you might have raised a burr on the insert when fitting. Pull the insert out and check to make sure there are no bad spots on the outer diameter.
The conclusion is that something is pushing the insert up when the bezel is fitted. The crystal retaining ring appears to be just as far down as it should be. Yobokies slant bezels appear a little thicker than norma but cant be pushed too far down as the bezel won't allow that. I just cant work out whats going on and I've ordered a new genuine crystal which I intend to fit with another cystal retaining ring and new gasket.
Anyone ever had this problem and am I going about things the right way?