Sucks!!!! I'm used to putting some solder on the tip and going from there, the cold heat you have to keep the wire accross the split contact to make heat and it MUST stay there to get the solder to suck in. I have one and tried it but it took too long compared to the good old iron! Good pic, I should have took one of mine before I installed it.
This same setup has been on my car for about 2 years now with no issues. I do have 1 high flow cat so I'm thinking that's why it worked for me so long versus the guys with the headers. My cat cleans some out, but being 3" and high flow, it doesn't do what the ECU wants when it's cold out, so this fix does the trick. I might add, I only got the P0421 code when it was cold out. When it was warm, zero codes.