Hi....lemme see if I can help...
When you say it only came with "one pin" do you mean it only came with part of the positive contact at the top of the mod? Because it's supposed to have the positive contact that connects to the pin on your atty and then it's supposed to have the positive contact pin that screws into the other contact that you can adjust to make sure it makes a solid connection with the positive on your battery to it won't rattle and fire properly.
is that what you mean? If you can put up a picture that would be a big help....and if that is what you mean than you can probably go to a hobby shop or a home depot or another hardware store and find a small copper or stainless screw that could screw into the positive contact for a few cents to a dollar and fix the problem and then you can make sure you have a screw that fits exactly for your needs
If that is not what you mean then I apologize and please tell me so I can try and help the right way
