The KOBSERT® technology is ideal for both reinforcing threads and repairing defective threads. The threaded bush is mechanically anchored without additional securing pins or washers and without chemical adhesion or sealing materials.
The sealing ring version is designed for gas and liquid-tight joints.
https://www.nutsandboltsfishing.com Captain Cefus shows how to tie a Uni-Knot – used to connect main line to leader. Also used to connect hooks, lures and swivels