Copper Fishing Line termination kit from Blood Run Fishing. Kit includes Blood Run size 8 micro swivels and heat shrink tubing to terminate (10) copper fishing line reels.
Termination is done by sliding a section of heat shrink up the copper fishing line prior to connecting the copper line to the swivel. After the copper has been connected to the swivel, the heat shrink can be slid down over the knot and secured using a lighter.
The same process would take place on the leader end of the copper fishing line.
Caution, do not place heat shrink or heat of any kind near your backer or leader material.