We raced a divisional event at Sears Point (Infineon) several years ago when the scales used to be about 1/2 track next to the road course. The wind was blowing very strong from the finsh line to the starting for the first time all weekend. Andy Manna won a round in comp but was bounced at the scales for being too light right in front of us.
We went through the scales and were 25 pounds lighter than the round before making us too light. They admitted it could be the wind under the back of the body so I asked if we could turn the car around and face wind and the answer was "No." So we pushed it back off the scale and pushed it back on one more time...plus, I told everyone to stand directly behind the car to block the wind. We were right on the money at 2,250 with it flickering to 2,245. They gave us the thumbs up.
Later, I asked the guys where the big crescent wrench in the seat came from. No comment.
RG