After collecting up most of my Trangia burners so as to give then a good clean, I noticed quite a few variations to the screw cap warning information ...Out of the group I have there are five variants.. I thought I would take some pictures and add it to the forum.. It would be interesting if anyone can add to the five variations here... Interesting to note, the fifth screw cap is the most common of my burners, and out of all the caps this style is the only type to feature cracks on the sides. No other screw cap design shows this. ( No, i'm not over tightening them..No, I'm not snuffing out the burner with them.) They do feel thinner than all the other type.