That is a great fix, I have to do the same for EC-Mesh coils with the Atlantis adapter, the pin is just a hair too short so an o-ring on it gives it a proper connection length. I just have to remember not to throw out the old coil without taking the o-ring off first.My soldering gun is either shot, or I s**k at soldering. Couldn't get solder to stick to the positive pin.
Found a great workaround tho- will the positive pin out- I slip a very tight fitting o-ring over the positive pin all the way to the bottom of the pin; then reassembled it all (Had to put the collar on the bottom of the deck first as it would not fit around the added 0-ring) The positive pin still screwed in tightly, but not quite as far- so it now makes contact.