Most watch bands, including Citizen, Seiko and many other brands are held together with cotter pins which look kind of like a hair pin. They are V-shaped with the ends flaring out a bit to make a little ball at the end. Over time, the pins wear out and the flared ends wear down and the pins fall out. After new cotter pins are installed, the band will hold together just like new. In rare cases, Titanium bands will fall apart even with new cotter pins. In this case, we can secure the pins with adhesive.