I've considered building a small higher temp version of a damp box; a drying box that is thermostatically controlled to not exceed about 150-200 degrees to deal with this situation. I now just run a heat gun back and forth, keeping it moving since a heat gun can melt solder. Don't let it get any hotter than you can touch without getting burned and you will be well below the melting point of solder but plenty hot enough to drive out a small amount of moisture.
I would like to ask if anyone knows of other double makers, especially American, who drilled vent holes in lower ribs. I occasionally see this and generally assume they may have been redone at some time, but often there is no evidence of refinishing.
