Found it!
After spending the entire morning and more driving around to various hardware stores and industrial suppliers for a replacement spring, with no luck at all, I gave up and went home. I did a few chores around the house (mowed the lawn, installed a ceiling fan, etc.) and then decided to give another try looking for the lost spring. I took a large magnet and put it in a plastic bag then started moving it across every square inch of my garage. I moved everything around and ran the magnet under everything. After about an hour and a half, I gave up. I pulled up a folding chair next to the wing and sat and pondered my next move. As I sat there with my elbows on my knees and my chin in my hands, staring at the floor I saw the missing spring laying there in plain sight! WTF!. I had been over that very spot many times.
OK, yeah, I know. Next time use a freakin bag!
Joe in Modesto