it is Keystoker 90K
I would say only 1-2 pounds reduction, but seems to work, it keeps it trickling down into the feeder easier. I normally keep it full, but sometimes forget and it almost went one night before the modicification.
You are still going to have coal sitting on the flat spot and never get to the feeder unless you help it by hand.
Yes, more bends and probably more time/money for the manufacturer. the old saying "KISS" - Keep it Simple *****
I always like to tinker and find a better mousetrap and share my ideas.
Did you see my top vent modification (to be connected into the furnance in our new house once we move in) It is the other posting under Koker 160 advice?