Aaron Parrett

Desperately seeking a solution to a mystery (Cylinder Jamming)

I have a Vandercook 219. Not sure but I think NS (1957). It prints like a dream, or did until this afternoon. The rolling cylinder suddenly started to hang up about 3 inches into the forme.  So the first few inches of the forme prints, but then the cylinder meets profound resistance, as if something …

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Mystery adjustment mechanism on VANDERCOOK 219

I am wondering what these two screw adjustments are for: The first is the square assembly near the inking plate with three screws, but then behind it recessed into the bed is a hex screw. I can’t find reference in the manual to them, but I could easily be missing it.