Support features for extendable elements of a downhole tool body, tool bodies having such support features and related methods

An earth-boring tool, comprising:

• a tool body configured to rotate in a wellbore;
• at least one extendable element carried by the tool body, the at least one extendable element configured to move between a retracted position and an extended position projecting radially beyond the tool body, the at least one extendable element comprising a mating structure formed at an upper end of the extendable element, the mating structure comprising:
• a stepped structure comprising:
• a base surface to which a longitudinal axis of the at least one extendable element is normal;
• a step formed to one lateral side of the upper end of the extendable element, projecting from the base surface, and having an upper surface, the stepped structure ascending along a direction perpendicular to the longitudinal axis of the at least one extendable element;
• and
• a mating surface extending between the base surface of the stepped structure and the upper surface of the step;
• and
• a support structure secured to the tool body, the support structure comprising a recess configured to receive the step of the stepped structure of the mating structure, the recess defining a support surface facing a rotationally forward direction of the earth-boring tool and configured to abut against the mating surface of the stepped structure of the mating structure of the at least one extendable element when the at least one extendable element is in the extended position.