Neale, bear in mind that I am just pottering in my little workshop under my house and don't own any specialized tools. Basically, I just use a a bench vice, pliers and some large drill bits. Put a drill bit into the vice, and bend the wire around the drill bit until it's almost a circle. Then I put the loop into the vice, and use the pliers to twist the tag end around the main wire a number of times. Then cut the tag off with a hacksaw. Crude but effective. Take some practice to get it looking reasonably neat, but that's part of the fun.
Cheers
Angus