Oki PM4410 - Manual (Page 29)

E-27 Pacemark 4410 Setup Guide
2. Push on the rear-feed access cover tabs and push the cover back, then
push on the back access door to release it.
3. Pull the lock levers forward to unlock the tractors, and position the
tractors to roughly fit the width of the continuous forms you will be
using.
The movement of the right tractor (as viewed from the back of
the printer) is limited to ensure that the paper covers the
paper-out sensor.
Lock Lever
Tractor Pin Cover
Pins