Hi
I tightened the nipple as much as I dare. I lit the lantern and success. It worked. So the following day I did it again and it worked again except at the end. A ball of flame surrounded the mantle. It rotated the blue dial and that seem to sort it out.
I lit it the following day to build my confidence and it didn't light. It had a ball of flame around the mantle. Once it had cooled I checked it over and discovered the burn chamber and the ceramic burner had come loose. So I tightened it up and lit it again. Success!!
Since then I've lit it 2 or 3 times and had no problems. So I am feeling that the worst it over and that I know my lantern and how it works. I am hoping I know the common problems and how to fix them.
I just wanted to say thank you to all your help with this matter. This forum has been very helpful and essential for me to understand what is going wrong. Without it I would have given up.
Thanks again
Jonathan