Lumix DMC LX100. I dropped my bag the other day and when I got home I found the front ring had dislodged. I managed to remove it and screw it on again and all is working fine. However, I now notice a dust blob has appeared bottom of each picture. I see there is a screw underneath the lens, but I'm unsure if this would free the lens to inspect it or if the screw is simply one of many holding the casing on. Also, I guess the dust could be on the sensor instead and I could make it all worse. I am not near anywhere I can get someone to look the camera over and would probably have to send it to Glasgow to get it fixed, if possible. Maybe as well to buy a new one?