I liked the Rockler method of threaded holes in the bar and flat headed machine screws. Great customer service and warranty. She LOVES these. He says he does get some pressure after long wear, but I imagine over time they will relax and fit him better. They were easy to put on but the strap just barely fit to the velcro. THEY ARE just too low Something I also have to mention is that I got these to replace my "110s" but I did have another backup pair of 110s and trying them on the same device with the same settings, the 110s ironically do sound better but doing a "side by side" comparison . I had a second set of hands trying to put the top on, to no avail. The bottom portion is plastic and it does feel like it. After weekly phone calls and attempting to speak with a non native speaker every time, Ive given up and will be forced to purchase another pair from a different manufacturer. I have a woodworking track system from the States, which uses imperial threaded parts.