I have my DAC on a 2U rack which is tilted backwards a bit to allow better access from above (or something like that). This would have the DAC slide backwards when I try to plug my headphones in, requiring me to hold the DAC with one hand and plug the cable in with the other. I wanted to have the DAC fixed in place so I can plug in my headphones with only one hand. It is a bit of a silly thing not make a design for, but it has worked well and I'm glad I made it. The design is not very elegant but it works perfectly.