So recently (i.e. towards the end of last years camping season) my
fridge stopped sparking (igntion of the flame). I finally got around to
pulling the fridge and checking the combustion chamber.

Sigh more ash in there (I thought I had cleaned that all out 2 years
ago.) I also realized that the sparker needed cleaning and adjusting.
Anybody got any idea how wide the gap should be?

I guess I can experiment with it (Bentley says to check for spark, but
doesn't have any details on any adjustments).