smokey-bones I wish you had some pics too. That sounds like a great mod. Someone recently posted that they had to place a fan blowing into the firebox vent to get the fire hot enough to cook in the cold. Better draft allows for better heat control. During the upcoming winter months the hotter fire will come in handy to keep the cooking chamber at the desired temperature. After a short learning curve you'll have temperature control mastered and be able to cook year round.
