I have a very old Buck Stove (circa 1980's) with two doors, and each door has an "insert", presumably for glass if one were to find them. Currently populated with insert blanks, square steel pieces that came with the doors, with a screw on each corner holding a "cam" (piece of metal) that holds the insert inside the door. No matter how much I bend these cams to keep the insert firmly in the door when the screws are cranked, I can't them "air tight", as when I close the air gates on each door, I can hear wheezing as air is sucked in through the very loose inserts. Would "Stove and Gasket" sealant work here? I'm not above talking them off and to a shop to have the inserts welded shut.