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A re-useable fastener intended for the temporary assembly of a pair of objects that are made from composite material. The fastener body itself is made of a self-shape restoring elastomer with a tubular shank to be placed in aligned holes in the parts. It has a head at one end of the shank and an axial passage from head end to blind end. A headed, threaded bolt fits in the passage. A metal washer fits against the head, around the passage. An internally threaded insert is fitted in the shank to receive the bolt with its head against the washer. When tightened, the blind end of the shank froms a bulb, and the shank enlarges. When untightened, the body relaxes and the body can be removed. Alternatively, the bolt head can bear against the blind end, and a nut can be threaded onto the bolt shank, bearing against the washer to set the fastener. If desired a tubular rigid body can be placed inside the passage within the depth of the holes to limit the deformation of the shank inside the hole.