I had been doing this.I found it easier to store that way as well as transport. I just kept mine on the lens. Even so, the ring on the actual lens still came off. Still not sure if that helped add to this problem or not.
Has this been the case with the rest of you where this has happened? Have all of us been keeping our external zoom gear (housing gear) attached?
Great topic. I have the exact same problem with my 10-17 on my Aquatica housing and kinda thought I would be alone with this issue. I managed to put it back together and loaded back in the housing prior to my trip but it took me about 10 attempts as everytime I tried to put the camera in the housing the zoom ring would catch on the wheel and pull the rubber ring and tape off the lens.
Hopefully I'll find someone in Singapore who can repair this.