Hi. We have a VNC20B and the front turret has stopped indexing for some reason. If you put it in MDI and type in a tool selection the turret moves out from locked as if to turn and then just sits there. If you then turn the turret by hand to the correct tool position it will lock itself back in. It was working fine until recently with no crunches on the machine or anything to explain it. Anyone ever have a similar problem or able to help?