Challenge JF Instructions And Parts Manual page 22

The blade can be squared to the paper by loosening
the socket screw in the knife itself and rotating the blade
until the edges of the knife match the edges of the
paper.
The blade can also be adjusted into or out of the paper,
depending on which blade you are using, by loosening
the socket screw on the front and tightening the socket
screw in the rear of the attachment to bring the knife
forward, or by loosening the rear socket screw and
tightening the front socket screw you can move the
knife farther back.
Your Challenge paper drill is now ready to corner.
NOTE: Maximum cutting capacity is 1" (25 mm).
Be sure to check the stroke adjustment to prevent the
knife from cutting too deep into the cutting block.
F.330-J/APR 97
22