most people that graft, don't. You learn how to "read" the age of the larvae in the comb that you pull out. You find the eggs that are still standing up in the cell and then look to the edge of that patch for the newly hatched larvae to graft.
You can put an empty frame into the breeder queen's box 6 days before grafting. The bees will clean the frame for a day or so and then the queen can lay in it and you'll have a lot of larvae the right age - but you still have to choose the right ones. Sometimes on a flow they will just fill your empty frame with nectar so it needs to be one of the few places for the queen to lay. But, on a small scale, adding the empty frame is just extra work. For me, it is easier to just hunt for the larvae I want in the breeder queen's box.
>How do you contain the queen on a frame for correct age larvae to graft?
I don't. I do have the queen in one eight frame medium box enclosed by queen excluders above and below so I know what box she is in and I just find the right age larvae. But if you want to confine her, a push in cage of #5 hardware cloth works.
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