For the year and a half I've owned a K75, getting the side cases off and on were a major pain. Frustration was quick to arrive. Out of desperation, I did a search on this forum and Frankenduck's instructions listed above, were the answer. I tried his method and the left side came off and went back on with seemingly no effort. The right hand side was a bit tricky, but once I positioned the case at the exact spot, it went on easily and I was able to lock it in place. Thank you Frankenduck!