Here's a close up Phu. Just a long strip of sheet metal that's just a bit wider than the vent hole. I then round of the edges and bend the top end. Then just a self tapping screw. I've never had any problems with them. You could use a nut and bolt too along with a drill bit. If you use the self tapping screws, be careful not to overdrill them or the will strip the hole and will not hold tight after that.
I'm a big fan of those self tapping ones. I use those farkers for everything! 
If you got anymore ?'s, lemme know, Bro!
Bob
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PBC-Courtesy of Poobah, 22.5 Weber Kettles-A, K, DR Stamped, 18.5 Weber Bar-B-Kettle Black and Red, Weber 18.5 Smokey Joe Platinum, Weber Genesis Silver, Lil' Chief Smoker, Discada Set Up,OKJ Highland Offset.
BobBrisket Jr.-MUDS, WSJ Silver
My BEST Compliment....."You're a good cooker, Dad!"--My Son :)
Miss You, Marty and Bull! RIP
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