'A-Go-Go' was the first machine to use a captive ball spinner, invented by Norm Clark. During the production run, the coin door was changed from the large single-slot to a smaller multiple slot and the drop-down cabinet was eliminated. We do not know how many games were produced in each cabinet style. Reportedly, the January 1967 issue of the German trade magazine M�nzautomat stated that the standard cabinet games were Later Production games and were manufactured due to a high demand in Germany.