you can even have an orange peel effect to the surface texture if you wish to hide metal defects. the owner let him stay with the new owners. put the edge of a coin or flat screwdriver tip into the slot and turn the slot clockwise to lock the cover. you can ask your university to sign the pledge. it will be beneficial for the fish which you keep in the pond. but my time for travel was limited, so i eventually decided that they would have to wait for next time. 