I have a ‘06 Sierra half ton pickup with a 5.3l engine that needed a new water pump today. Pretty easy job, but the wind was blowing about 25 mph on a 40 degree day in the shade. Still pretty nice weather for January in Wyoming. Anyways, had a lower radiator hose being a bear and took quite a bit of persuading to get loose. I had a rack of sockets sitting on the air filter housing and as I was leaning over the tools to position myself to get full torque with my grip, I got her loose, but the 20mm socket came off the rack and I never found it. After some time, I had to admit, it was gone