Roller tensioning assembly

An adjustable roller assembly for a linear rail system carriage, the adjustable roller assembly having an axis and comprising:

• as indexing collar having a first indexing structure;
• an eccentric bushing having an adjustment side end and a roller side end opposite the adjustment side end;
• an adjustable roller rollably mounted to the roller side end of the eccentric bushing, wherein a rolling axis of the adjustable roller is offset from the axis of the adjustable roller assembly;
• a suspension element comprising an inner core and an outer sleeve torsionally elastically coupled to the inner core, wherein the inner core is fixedly mounted to the adjustment side end of the eccentric bushing with the suspension element in axial alignment with the eccentric bushing;
• and
• an adjustment collar having a circumferential flange having a second indexing structure, wherein the first indexing structure and the second indexing structure are coupled to rotationally couple the adjustment collar with the suspension element.