A 1" pipe bracket mount

thingiverse

This part was designed specifically to hold the top of a monitor firmly in place on a tripod neck. The front and back sections grip securely, and there's also a mounting slot that accepts a 1/4 inch bracket - one that can be fabricated as needed, I just required a simple hook to prevent monitors from wobbling precariously from side to side. To assemble it: simply print the design, then bolt it together using 10-24 or 10-32 bolts and corresponding nuts, and enjoy the satisfaction of your handiwork.