Hi. Any advice on how to make 12 or 14g bare wire fit into a spring clip terminal? I pulled about 1/2" insulation off the wire and twisted it tight but it seems to have difficulty going in the clip hole and the tight twist ends up looking like a mini-brillo pad ; ) I notice some wires have a solder coating at the end to make them effectively one wire. What is the simple approach to doing that? Thanks!