Media binder arrangement (10) comprising at least one spring clamp (15) attached to the spine (14) of the media binder. The spring clamp (15) having an interior cavity (19). The interior cavity (19) of said spring clamp (15) is additionally formed with a datum spacer cavity (35) having spacer walls (36, 37) limited from the sides (16, 17) by a bending. The spacer walls (36, 37) having wall surfaces facing the clamp base (18) for holding the datum spacer (30) in abutment with the clamp base (18). Method of manufacturing such a media binder arrangement (10).