An apparatus for workpiece assembly is disclosed. In the illustrated embodiment, the apparatus includes a carousel which rotates between a plurality of assembly stations for assembly. Workpieces are loaded onto or unloaded from the carousel at a load/unload station and the carousel rotates to position workpieces proximate to the plurality of assembly stations. As illustrated workpieces are loaded into a plurality of assembly nests on the carousel. The plurality of assembly nests include alignment fingers rotatable with the plurality of assembly nests or carousel to align components, for example to align discs of a hydrodynamic spindle assembly for merge operations.