Numbcoffee can you post a picture of the front of your stove and then a pic of the burn pot the plate sits on?
Thanks so much for the help with this, I am curious to see what we can do as yesterday its performance wasn't the best, then I realized that the pellets from Michigan Wood Fuels were probably the culprit as Propellets were much better.
I am in the office at the moment but do have some pictures that will hopefully help, until I can get home. The first is the serial tag on the side and the other is the best I can do, from an auction site but very similar. The plate on the left goes down further hiding the exhaust chute but mounts on the tubes, the plate on the right is the same and then there is a trapezoid shaped plate on the top with a diagonal plate on it.
Very different to the more modern ones.