I do not know how it's done previous buyers to mount the protective cover on their Canon 5d II. It is impossible to leave it in the current configuration. To mount (or unmount) your goals you are forced to cut the lip around the cover. This product is leaking, it does not match the Canon 5D mark II format. On top quality plastic is not good, it slides. I'm going back to the old gaffer to protect my camera. Important if you have mounted a grip on your device, you can not mount the protection of increases.