Prepare pieces (Back piece with ring, window and insert).

Fold insert with printed sides facing outwards, and place into the concave hollow of the back piece.

Clip window firmly into the hollow to seal insert into keyring. (Please note that the windows will consist of one flat side and one convex side in order to complete the slightly curved effect of the keyring. Place the flat side face down into the hollow to avoid achieving the wrong result with the finished keyring). Finished product.