Gasket modifications were done and it's the IQ120 (that works well). I'm using hard mesquite coal and had my fire in the bottom of the fire box. There doesn't appear to be any heat loss and I'm getting both smoke and some heat out the top of the stack. I did find some smoke loss both at the top and bottom of the smoking chamber where the factory had welded the body and round ends together. Intend to fix those with sealer from BBQ Gaskets. I'm also having a problem with the factory latch
closing. Don't know why I've reset it a number of times and it doesn't seem to want to completely latch however the top and bottom latches are working great. I'm going to fire it up again today but build it closer towards the smoking chamber (it was in the center yesterday) and see if that makes a difference. I switched from briquettes to hard charcoal about 2-3 years ago should I combine the two or switch back ( really don't want to)?