Oh and one more thing... Christ - Perseas must be hating my guts by now!!
The contact plate section inside the bottom of the heron - uses a threaded brass plate in the plastic to make final contact with the bottom of the positive pin that goes up to the coil..
After a few days the area that makes contact with that pin suffers a chemical reaction due to condensate and oxygen influx
(I theorise it's some sort of electrolysis process occurring here) that causes build up of some sort of
(I'm guessing carbon or an oxide) if left unchecked it will eventually cause current continuity issues and would require regular maintenance. I basically clean mine every few days with a nail polishing pad (nick from your wife's make-up box!

)
It's not a problem just something that needs you to keep an eye on - take it apart and clean it now and then.
For future versions of the Heron - I would suggest that silver plating of that particular contact plate or even just using good old stainless steel - (just like the spheroid) would make it totally maintenance free..
Brass obviously knocks the socks of many metals when it comes to electrical conductivity - but even saying that I have never noticed a problem with atomisers that use a Stainless contact plate - like the Spheroid itself for example - when it comes to voltage or current issues - in other words stainless works just fine..
So I suggest keep the brass for the telescopic part of the bottom pin just to ensure good conductivity - and replace the final contact plate with either stainless or silver coated brass..
And that I promise is the last of my suggestions!