Yeah man , I just strung the wire along all the contacts , and soldered directly to the contacts , and that ' s enough to melt through the enamel . And that ' s it , totally clean , no residue . My other suggestion is buying switches with the diode incorporated I got my cherry reds from 7 bit on deskthority with the diodes built in . Solder the diode contact to the switch contact , then all you have to do is run an enamel wire for each row , then each column . is the stuff I used , 0 . 2 mm worked fine , if slightly lightweight , would probably chose a larger gauge given the choice again <| sep |> Global Warming ! <| sep |> Bitch we do that in Ohio it ' s an all American thing <| sep |> Dude , seriously . I have like 24 more rooms , and I don ' t think I even had 50 k .