I am just going to pass this along but the other day I thought I would try and make my own center brick out of 1" X 4" steel, I have been using them for approx. 2 weeks with zero signs or erosion and also I noticed my chugging problem has greatly improved. My old brick had been in such bad shape that a golf ball could pass through the slots. It seems the wider the slots become the worse the chugging becomes, I have been burning with the air damper wide open with the new steel center bricks and before it would still chug with the damper all the way closed. It will be interesting to see how these steel center brick hold up over time. I have an oxyacetelyne torch and got the steel at the scrap yard so it cost me around $10.00 and around 15 minutes of work.