I've been taking silversmithing classes and have finally decided to set up shop at home. However, I've run into some trouble. I bought an acetylene air torch and went to set it up as the welding supply store instructed me to. However, he had just told me how to set up the hose, not how to open the tank. I also never got the lil mini wrench thing to use on the pin. So when I called him, I tried some things he suggested and, when none worked, gave up.