I have injected Bt. You want to do it at all the leaf axis for sure, as that is often where they are as well as between axis.
The most effective way to get rid of vine boreres is take a knife and slit the stem from the bottom upwards til you do not find any more. Then take some soil and pile it over the stem where it was slit. Put the sprinkler on til the area is soaked well, then fertilize. The vines may wilt, but water every day for a week or so and they will usually come back unless there were too many borers or you waited too long.
You can easily tell if you have borers because there will be frass, (grub poop and some squash vine "sawdust") lower down on the vine, often at the leaf axis.
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