We have a Cheap Charlie HCF120 that came with the house we just bought. We are trying to get it ready for winter, and I noticed that there was a bit of leaking around the door. After pulling the door apart, and the ash door, I noticed that the gaskets installed were really poorly done. My question is: how thick is the glass door gasket supposed to be, and does it go all the way around the channel? The one(s) I took off were only on the vertical sides of the channel. Thank you!