An automotive vehicle door has a glass window that is raised and lowered by a window regulator that includes a roller cable assembly (15). The roller cable assembly (15) has a rolled section guide rail (18) and a bracket assembly (16) at the lower end portion of the glass window that runs on an L-shaped flange (36) of the guide rail (18). The roller cable assembly (15) includes upper and lower roller assemblies (28 and 30) at the respective upper and lower ends of guide rail (18) and a cable (20) that is trained on rollers (22 and 24) of the roller assemblies and on a drive roller (26) that is driven by an electric motor (32). Each roller assembly includes a base (42) that is slideably attached to the guide rail (16) and a detachable cap pin (44) that attaches the guide roller to the base (42).