I have the same stove installed in a newer manufactured stove. Drafted poorly and smoked terribly until I put a length of flex pipe from the cold air feed to the outside. On the bottom rear of the stove , where your register rod slides in and out, there is a box. Mine had a 2" round outlet. I used 2" automotive exhaust flex pipe to get cold air from the outside. On the exterior wall I used a screened dryer vent. It was necessary to use PVC couplers to mate the pipe to the vent. Before opening up to outside air the stove was horrible to light . Had to use fire starter etc. It also caused oxygen loss to the home causing me to awake in the night struggling to breathe. Now it's lights fast and simply and heats a 1600 sq ft area with no problem. I'd also try to simplify the way you shift your flue pipe. Hope this information is helpful.