The bolt for the butterfly valve 3/8 X 8'' stainless eye bolt with stainless washers and nuts, bolt is ground down a little over half way with a angle grinder. The disk is from the hole saw hole from drilling the cabinet.
The heat comes from a removable 1500 watt fan forced unit that came with the cabinet. I had to replace the fan and motor due to it being damaged by someone trying to fix it before i got it.I also replaced the thermostat due to the same reason i used a 50 - 250 centigrade unit I, also added a speed controller for the cabinet fan and a small exterior fan to cool the main fan motor and it also pumps some fresh air into the cabinet for the Todd`s smoker tray.
I added a piece of stainless for the bottom of the door to seal against.The unit sets on 4'' swivel casters.
.This was a fun build and I hope you enjoy the pictures. ; )