Yet another reason to get a 3d printer.I have made several cord-based ligs Using 3D printed parts and hardware. I use them on BCs.
Bass Clarinet Ligature by MojoBari
DIY string ligature design. I added overhangs in the rear to grip the back of the mouthpiece body to keep it from slipping due to the body taper. The side pieces are decorative but they do help the ligature hold its shape when you put it on/off. I like to put it on very tight so it does not...www.thingiverse.com