The picture shows the best view of the anchor which consists of two cast body parts sliding apart. What did matter was one that had a thinner metal body, mostly bent to the sides. Bending the metal requires a certain amount of torque, so the screw usually turns before it settles in the hole. I wanted to replace the "flexible" type that came free with the instrument with a cast type. What you get looks like an ITW Red Head tube bolt.
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