I just installed a new fireplace door on our 50s stack-stone style fireplace. Because of the variation in depth of the stone and mortar, there's a roughly 1/2"-1" gap in some areas between the door and the stone. We bought the doors to cut down on draft, so this gap isn't exactly desirable. What is the best (non-permanent) way to close this gap? The best options I see right now is either high-temp fireplace fiberglass insulation (like what came with the door), or a stove rope. I like the idea of a stove rope because it seems like it would be easier to stuff in the gaps... and it comes in black which will be harder to see. (Note, discussions of providing combustion air aren't necessary here since we will leave the glass open during a fire as recommended... the seal is only important for when the fireplace is not in use). Thanks!