That is what happens around here in mid July in the heat. Tomatoes from early trusses are hopefully putting on size and then the heat hits and there are lots of misses. They don't self pollinate well in those conditions.
One year, maybe two, I did a good job of getting past that. It was by using a C+ tuning fork in the morning while it was still cool. This was when I was florida weaving. I had a lot better recruitment that way, but of course I over did it and broke the thing. At that time they were like $4 shipped off ebay, just a junky cast tuning fork, but it is in the range of a bumblebee's wingbeat, and it surely worked for buzzing off pollen.
I ordered a replacement but kept misplacing it and haven't used one in a few years. I found it this year and plan to put it to use on single/double stemmed plants.
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