Bootlace ferrules work well, thin wall, and crimp onto the wire and fuse well. Just slide thermal fuse wire in one end, and wire the other, and crimp. might have to use a slightly bigger one, but they are easier to find over bare small crimp connectors. But I just use long nose pliers and solder them in, especially with those like 130C and 200C versions. 70C you really want to crimp, or leave the leads long, and sleeve them after crimping.