While our glue is setting, we use our long straight edge to get a centerline on the door. The straightedge is lined up with the 2 glass channels and the door is marked. If the lines are drawn accurately, they should be equally spaced at the top of the door and at the bottom. In the photo below, we are drawing a line right down the center of the 2 channels. For the best possible operation, our regulator should be mounted close to this line.
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