Vandercook Positive Lockup Bar adjustment

My lockup bar - Self-Squaring and Double Acting - needs adjusting. The floating bar that comes in contact with the form does not square. One side is a little lower than the other. Before going into the piece to make adjustments, I want to ask if anyone is familiar with this problem. What should I look out for or be careful of? Thanks.

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The mechanism of these lockup bars in very simple. Don’t be afraid to take it apart.

Daniel Morris
The Arm Letterpress
Brooklyn, NY

image: lockup.jpg