to be indexed for the operation of conveyors r and s conveyors r and s are configured to locate a bottle with respect to a given diameter of a bottle for any change in the diameter of bottle the conveyor r and s would have to be reconfigured to accommodate the change in diameter to alleviate the problem of reconfiguring the conveyors r and s the synchronization means 15 and 16 is used to space and position the bottles so the arms of the conveyors r and s are in registry with the center line of the bottles the positioning of smaller diameter bottles requires creating a gap between the bottles so that the centerline of the smaller diameter bottles is in about the same position as the centerline of the largest diameter bottle to be processed speeding up conveyor d in relation to conveyor c creates a gap between the bottles as the bottles leave dead plate 11 an automatic control mechanism such as an electric eye can indicate the size of the gap created a star wheel can be sized to position and create the desired spacing between the bottles different star wheels could be used for different diameter bottles fig6 shows.