Device for securing an insert in a structure

A device for securing an insert in a structure having a first opening, said insert having a principal body inserted into said first opening, said body having a first side, a second side and a second opening extending between the first and second sides, the second opening having a principal axis, said device comprising:

• a shaft configured to pass into the second opening from the first side of said body and through said second opening so that the shaft extends out of the second side of said body,
• at least one detachable or non-detachable head affixed to one end of the shaft,
• at least one roughly planar part having a third opening, said planar part being designed to be placed on an outer face of said structure so that said third opening is centered on said second opening for the passage of said shaft, said planar part, locking said insert in said first opening,
• a system for blocking said planar part from rotating relative to the principal body, and
• a joining element for joining said head onto said planar part to substantially nonrotatably lock said head onto said planar part, said head being designed to be supported against said planar part in order to secure the planar part against said outer surface, wherein the joining element is distinct from the head, one end of the joining element being configured to engage the head and the other end of the joining element being configured to engage the planar part to effect substantially nonrotatably locking the head onto the planar part.