Eagle vision Adjustable Scope Rings

How does everyone else torque this type of wing nut? (not sure of the name)

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I went the easier way and took off a hex nut off another set of rings.

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But I'm curious how I'm suppose to torque the wing nut. I used this type of rings on other guns before but I would use a small allen wrench and insert it into the small holes and just guess the torque by feel.