Loosen the middle lock screw before turning roller height adjusting screws.
Adjust both screws in tandem, keeping the blocks holding the roller cores parallel to the frame. Failure to so will impede adjustment and may strip screw threads.

The roller adjustment on this press is what I call old style. It’s the same on all models before the Universal series, which Vandercook called “Quick Change.”

The 215 is nearly identical to the No.4 including the roller clutch and gear assembly.