I took my camera down this weekend and decide to bake the desiccant and when I took the filter wheel apart this is what I found. The filter wheel is the FW7 STX connects to the stx 16803. I measured the depth of the corners and there was a difference between in depth from where the corners broke compare to the other corners where the filter did not break. The depth of the corner that broke was .00771 compare to the none broken corner of .00815. What do you think? I have never seen this happen before. The filters are the Baader 50 mm set.