Spring operated roller blind system with end position adjusting mechanism

A roller blind system, comprising a roller blind provided with a roller shaft through which roller shaft a central rod extends and to which roller shaft a flexible sheet member, such as a roller blind fabric or a screen, is attached, wherein the roller blind system is further provided with two bracket connectors for attachment at the outer ends of the roller shaft, wherein the bracket connectors are arranged for releasable coupling to mounting brackets for mounting the roller blind system on a surface, wherein the roller blind is spring operated and comprises a tension spring fixedly connected to the central rod and to the roller shaft characterized in that the roller blind comprises an adjusting mechanism for adjusting an end position of the flexible sheet member, wherein the adjusting mechanism comprises a spindle and a connecting member that is connected to the roller shaft for rotation around the spindle, wherein the adjusting mechanism further comprises a first bearing for the roller shaft that defines a first end position for the connecting member, wherein at least one of the bracket connectors comprises a pin for detachable mounting in a cooperating recess on the adjusting mechanism, wherein the pin and the recess have an unround cross section.