heidelberg 13 x 18 windmill gripper bar specs!!

Hi all! I am looking for specifications for a 13X18 windmill gripper bar as far as distance from the platen and maximum opening of the gripper bar t the top position! I am trying to check the simple things for registration purposes. The 2 grippers dont always register the same and i know sometimes it is just the stock we are running but not always. And it seems like every job i run on it nees to have a good down curl to the lead edge and the tail where it lands on the far left lay guage! Any info on measurements for the grippers on this would be greatly appreciated.

Thanks andrew p

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