First I have to thank Rob, he is the best. I replaced the collapsed spring in my Tumbled Grand. It is as good as new. When it collapsed, I was using a 306 atomizer. I had been using it for almost 4 weeks. I had cleaned it regularly. Just before the spring collapsed, I had a few burnt hits. It was the last one that collapsed the spring. Is this usually a warning sign? I am afraid to use another 306 for fear of another collapse.