A week or so ago I posted about my problem with a pair of pliers which slipped into a cavity through a narrow opening. I have now retrieved the pliers, and for those of you who helped with useful advice I have written below a bit about the process. Many thanks to you guys.
From Pep Boys, the auto parts store, I purchased a moveable mirror on a metal wand about 15-20" long. I also purchased there a magnet (first tested to ensure it would pick up a comparable sized pair of pliers) on the end of a flexible metal wand, again about 15-20" long. Each cost about $6-7. From an electronics store I purchased, for $12, a small LED flashlight.
I tied a string to the flashlight, and lowered it, along with the mirror on the wand. I didn't mention before that the hole through which I had to work was at the end of a very tight crawl space, so there was no opportunity for another person's hands to help me. With the string in one hand, and the mirror wand in the other, I tried unsuccessfully to locate the pair of pliers in the cavity.
Next step was mounting a drop light over my shoulder with a
100w incandescent bulb in it, and just using the mirror. That was better, and I saw where the pair of pliers was. Then I inserted the magnet wand, and that proved difficult since everything in the cavity was steel/iron and the magnet was pulled around. Eventually I was able to make contact with the pair of pliers, and move it around on the floor of the cavity.Then I was able to pull it directly upward toward the opening. As I tried to pull it through the opening it came off the magnet. I tried a few more times and then when it got near the top I used a pair kitchen tongs to reach in and grab it and pull it farther up until I could grasp it in my fingers.
One happy camper.
My next project is to fabricate a semi-permanent cover for that opening, with some small holes in it for ventilation.
Thanks again guys.