*WARNING! WARNING* DANGER WILL ROBINSON!
Yes, there are tools used in this instructible. Yes, there is sharp metal in this in structible. YES, use extreme caution when working with tools or metal of any kind, you CAN injure yourself.
Ok, with THAT out of the way...
Step 1: Measure and cut copper tube
If you don't have a fabric tape measure, you can wrap a piece of string round your wrist, and measure that. This is the length of tube you need to cut for your cuff. Mine was a bit more than 8". A hacksaw works well to cut the tube. If you have a tube cutter, I would recommend that for this step. It makes later steps much easier. I couldn't find a hacksaw or a tube cutter (though I own BOTH) so I used an angle grinder to cut it. The diameter of the tube will determine the width of the cuff. If you look above the vise, there is a LARGE copper cuff from a 2" tube in progress.