westend wrote:
I would bet that it is some type of expansion tube for a limit switch.
It would seem to be in fact an expansion tube. What it does and how it works (in detail) is still a mystery, one I've not been able to decipher yet, but I did learn a few things while searching last night.
Looking like next weekend will be good weather for piddling around with it, may go as far as removing the combustion chamber and cleaning it out properly. At the very least I'm going to re-install the tube as it originally was (and properly levelled) and test it for functionality.
