Sunday was a bit of a letdown, when I went to test it.

Firstly I couldn't get the leaf blower started that I'd borrowed. (I only have an electric one). Now I know why it's electric..............

After fresh fuel and much stuffing round and my right arm 200mm longer from pulling the bloody thing, it went, so off to a disused gravel pit 30 kms out of town.
It gave 2 very load coughs with a very rich yellowy flame and iced up. BUGGER!!!
I waited for 40 mins for it to thaw out, but my ignition had failed me.

I replaced the inition relay tonight, for no better result. After much more stuffing round, it turns out the 7amp gel cell had died. Under load it was going open circuit.
I've got another one on charge tonight so tomorrow will be D day with luck on my side.
Yes as sn said it's to increase the fuel flow, is why the bottle is inverted.
Also the surface of the gas freezes when a high discharge rate is being consumed from the bottle when upright and the jets quit.
If it works gibber, it would be my pleasure to get a snap organized for you.
Still have lots to do for Lefroy so back to the shed.