Which preposition to use with toggled

at Occurrences 1%

At the expiration of five minutes the large bull came up again for breath, with both lines still fast to him; the one in the regular way, or attached to the harpoon, and the other jammed in the jaws of the animal by means of the harpoon and staff, which formed a sort of toggle at the angle of his enormous mouth.

Which preposition to use with  toggled