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Only one arm will spin if you go that route. Inside that little plastic box already hanging on the clock is a set of gears driving either two or three concentric drive shafts, one for each arm on the clock. The gears are there to drive the second hand at its proper speed, the minute hand at 1/60 the speed of the second hand, and the hour hand at 1/720 speed.Can you just attach the arms to the reindeer motor?