The screw I adjusted (and didn't improve idle speed) looks like the vertical silver screw at the bottom of this stock photo of a throttle body:

https://turn5.scene7.com/is/image/Turn5/41101?$prodpg640x480$https://cimg2.ibsrv.net/gimg/www.cam...cbe37ed5bc.jpgThis is a stock photo, but the screw I adjusted is the same one facing vertically in the lower right corner.