Thanks for that observation, Jim. The mounting hole where the mount attaches to the water pump stud is counterbored on the front side to provide extra clearance between the nut and the water pump pulley. When I got my mount, that recess was full of schmutz; there had likely never been a nut on that stud. Also, the back side there had noticeable fretting corrosion from rubbing on the water pump boss. Judging by the amount of that wear, and considering that this was steel vs. aluminum, that situation had probably existed for the life of the previous installation. I doubt I'll ever put enough miles on my car to loosen things up, but it's definitely something to monitor.Be careful and make sure the mount bolts stay tight. That style likes to slightly loosen the bolts over time and vibrate. You don’t ever really hear it it. But the bracket will completely wear thru the stud on the water pump.