After reading this thread I was so impressed I decided to register here. I was formerly a member of Britel-t's now defunct forum, and never got any straight answers to my questions - only endless image management and excuses. They always seemed to be more interested in telling me how malfunctions were not their fault rather than attempting to help me solve them. I am looking forward to more enlightening ( 
) conversations like this one.
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My Aida Express 1500 has the exact same problems. I have both a stainless steel #3ss and an "improved" #33-b purchased from Britel-t. My #34 expanded and it and my #3 fell out just as described here destroying an original Petromax thorium mantle......... 
The different coefficients of expansion in the metals is not a possibility that I considered when I originally purchased the parts. Britel-t said that they were planning to come up with a stainless #34 that would solve this problem last November, but it did not materialize. Muffler cement (aka gun-gum) got the lamp back together but now it flames when the #111 is turned fully open.
This happened after I used #2 Diesel instead of Kerosene for a while. This I believed was due to the higher BTU of Diesel compared with Kerosene causing compression of the softer brass threads in the #34. I see now that was not the case.
