My stove jack in my Kifaru paratarp annex is sewn in with double stitching. The lines of stitching are about 1/2 inch apart around the perimeter of the jack. The tarp is silnylon.
You might want to post over at the Kifaru forum or the 24hourcampfire backpack hunting forum as there are a lot of knowledgeable stove users on both of those forums.
I imagine a call to Kifaru would also get a quick answer.