Picked up a food grade 55 gal drum that had blackberry puree in it for my 1st uds. Burned it out, used a grinder with a wire brush, high temp primer, high temp semi gloss black. Went with 4 3/4" nipples and 1 ball valve. Made a thermo port out of threaded lamp rod. Garage door handles. Weber charcoal grate with expanded metal and pizza tray attached for ashes. Went with 2 cooking grates 4.5" and 11" from the top. A diffuser will go on the 3rd weber rack jusr above the charcoal basket and will use a pizza pan or pizza stone. Picked up 3 weber kettle exhaust dampers for the lid. I over burned the lid a little and it warped a little. Anyway to fix it?