Just buy some of the power cord from VH audio and the connectors. No tec-flex is needed, just some wire strippers and about 5-10 minutes, save you a lot of money and end up with better product. It is hardly even DIY it is more like connecting some locking banana plugs level of difficulty.
Actually her is a super effective cable to use... Attach the shield to the AC receptical side to use it as a drain. It comes with the ground in it unlike most VH audio stuff that is not $80+ a meter. (there are diminishing returns on power cords as the price increases especially if you have power filtering as the function of the cords construction and less and less to do with the achieved sound)
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=100-790Then use what ever your choice of
http://www.vhaudio.com/connectors-ac.htmlTools to use
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=360-630http://www.parts-express.com/pe/showdetl.cfm?Partnumber=360-821Instructions:
Use cutters to cut the outside insulation jacket to the length of wire that will insert in between the compression plates on the AC plugs, and then about 1.5cm past that. Due that by cutting straight down the side, and then in a circle around. This is much safer than using a knife and cutting anything inside even a little bit. On the non IEC side unbraid the shield and twist it into a wire end next to the other wire you will use for ground. Cut out any extra insulation pieces or rip-cord, the stuff that is twisted in with the internal wires. Insert the amount of wire past the wire cutters cutting point (marked 12 for 12 ga) that you want the compression plates to be making contact with. Insert it on the side with the diagonal reliefs. Clamp down with wire strippers, twist away from the wire a little and pull, it will take the insulation off. Twist the exposed wire together. Repeat on all three. Slip AC plug back piece/s over the wire, then insert exposed wire pieces into corresponding holes between compression plates. Use screw driver to tighten compression plates onto wire. Do not forget on the non IEC side to put the drain wire (from the shield that you unbraided and twisted up) in wit the ground. Attach back piece of AC plug that compresses onto the cord with insulation still on it. Do this to the other end with IEC but do just cut excess shield.
Be careful that no wires touch, and that the shield only touches ground.
Hard to get much easier or cheaper and effective for a very high quality cable. You can play with adding ferite pieces (search for ideas on that).
Well skip all of this and buy the most over expensive cable you can with the most amount of canceling noise braiding/twisting etc you can without good power conditioning so long as it is better than what I just posted, but we are talking $200+. Yeah or get some of VH audio's uber sweet three wire cryoed stuff and make your own.