While installing a trolling motor mount to my kayak (Really? You're supposed to paddle them?) I realized that I could reach the head of the nut with a ratchet in my right hand and box wrench in my left, held under the deck, but my arm wasn't long enough to start the nut on the threads.
Step 1: Attempt #1
It should have worked. Unfortunately, I couldn't keep the washer balanced on the nut long enough to get it threaded. I tried taping the whole works together, but I kept either knocking the washer out of line with the nut or pushing the nut hard enough to make the tape come loose.
Step 2: Attempt #2
Sounded like a good idea to me. I lined up a row of stainless steel fender washers and put a drop of super glue on each one (you really can use too much.) Then, I carefully placed stainless nuts on each - the idea being, the washer would keep the nut from dropping through the wrench. Plus, I needed a big washer under the nut anyway, as I was bolting through the kayak's plastic deck.
It worked as well as I could have hoped. The nut and washer sat there, held nicely by the wrench, and I merely turned the ratchet to get the bolt started. Once I figured out how to do it, it took no time at all.