There was an X358 on Ebay Australia a short time ago and it had a clip around the top ring of the vapouriser. That had me wondering straight away because I was sure the clip was going to alter the height of the mantle in relation to the reflector. So I made a clip to see what would happen. The spigot was still able to screw in properly against the inside of the burner and the whole burner was able to spin on the vapouriser. It did of course raise the height of the mantle and would affect the reflected beam. This picture is with the #1865 X410 vapouriser, no ring and sitting in the burner as normal. This is the clip on a 606 (5 inch) vapouriser with the camera in exactly the same position. So it gave me an idea. Could these lamps originally come out with the 606 vapouriser and a clip. The clip would hold the burner on the lamp if the lamp was knocked over and they were marketed as fishing lamps. If there was an issue with the clip, (safety or marketing), the only way to have the mantle in line with the reflector would be to make a slightly longer vapouriser. What seems a bit strange to me is the the vapouriser label says X410 but the X410 and the X410A does not need the height alteration as they do not have reflectors. And I also wonder why the X458 and the X460 is not mentioned on the label. I had a look at the paper work I have to see if there was a gap between dates of when the lamps were first on the market and when the #1865 vapouriser first appeared but I don't have enough to make any conclusions. Any thoughts or ideas.