In message .com,
gasman pete writes
there was a problem with the early models that the spark gap opened
up due to the groung post (bent piece of metal ) moving away from the
spark electrode, there should be about 3.5 mm gap try that,
pete

Nah - I don't think so

you'd still hear the spark discharging somewhere, even if not at the
electrode. There is a spark gap on the back of the pcb just for that
purpose


--
geoff