Ryobi 3302H Operation Manual page 158

Chapter 3 Printing Practice
8) Control pushing volume.
Operation Edition - 72
When the paper is pushed by the push side guide, the flat spring should
bend about 0.5 mm (0.020").
(Note) If the pushing volume is too great, the paper will bulge as shown
in the illustration below and stable lateral registration accuracy
will not be possible.
Flat spring
Bulge Paper