I recently acquired two machines that have guaranteed delivery systems. One is a two piece side-by-side USI combo with iVend and the other is an AMS 39-640 with Sensit. Most of my vended items vend best when the spiral is set at the 6 o'clock position with a pusher placed at 12 o'clock. So as part of my normal routine to get a snack machine ready, I would manually reset all the spirals to 6 o'clock. When it came time to test vend each slot (with an item in the spiral), I noticed that some of the spirals would not return to 6 o'clock after it completes a vend. That happens on both the USI and the AMS. Because they both have guaranteed delivery, I am assuming that this problem has something to do with guaranteed delivery. How can I make it so that the spiral returns to its original position after each vend?