I'm new to the forum and vintage stoves. Excited to have finally found the time to start the restoration on my Coleman 530 I picked up at a general camping store in Wilderness State Park, MI! I was adamant on disassembling the stove completely as a learning experience and for a thorough restoration. Everything was going smoothly until I tried to remove the valve assembly from the tank... I could not break it loose. I cautiously applied heat to the valve assembly with a propane torch (lightly) and heard a clunk in the tank... A ring on the inside of the tank became unsoldered from something. I can't find the ring on the exploded parts view and I'm not sure if it's a critical component. I don't know how to get it out either. Eventually I broke the valve free by using a scrap piece of aluminum screwed into the frame screw holes. Didn't even need the heat afterall... Help is appreciated!