Method of assembling parts with interlocking device

A mechanical assembly of parts comprising a first piece of material joined to a second piece of material with an interlocking member and a fastening member, wherein

• the interlocking member has a thickness, a first end and a second end, and
• the second piece of material has an edge joinable to a surface of the first piece of material, said assembly including
• on the first piece of material:
• an aperture provided on the surface of the first piece of material;
• on the second piece of material;
• an opening provided near the edge of the second piece of material having a thickness around the opening;
• a channel communicating the opening and the edge;
• and on the interlocking member:
• a first slot provided on the first end along an alignment axis,
• a second slot provided on the second end along the alignment axis and separated from the first slot by a middle section having a hole therein, wherein the channel has a width greater than the thickness of the interlocking member;
• the first and second slots having a width greater than the thickness of the second piece of material around the opening;
• the length of the middle section of the interlocking member is smaller than or substantially equal to the opening;
• and
• the opening is configured such that the interlocking member can be inserted into the opening until the middle section of the interlocking member is located inside the opening so as to allow the first and second slots of the interlocking member to engage with the second piece of material, and to further allow the fastening member to be inserted through the aperture of the first piece of material and then the channel on the second piece of material for securely engaging with the hole of the interlocking member.