I have mounted a thermometer just below the top grill using a method I saw posted here earlier. I removed the top screw from one of the grill support brackets and replaced it with a 1" long hollow aluminum spacer held in place with small push on clips. I can insert either my Nu-Temp or Weber thermometer thru the hole and I didn't need to drill any holes. The brackets seems plenty sturdy without the screw and no smoke leaks out even with no thermometer in place. I would hope that Weber takes some notice of the many ways that people modify their WSM's and put some of this free R&D to use. I love my WSM, but there is room for some improvements that would cost Weber nothing to implement. At least they could put a hole in it so that mounting something so basic as a thermometer does not have to be such an adventure. By the way I want to add my Kudos to Chris for great web site, it is the main reason that I bought my WSM and have recommended it to everyone I know who is interested in great BBQ.(the site and the WSM) Thanks again,
Don