IBM 01 Maintenance Manual page 195

MODEL 81
CUSTOMER ENGINEERING
4.THE BACKSPACE PAWL STOP is positioned so that it
stops the backspace pawl as soon as the escapement pawl
drops into the next tooth of the escapement rack. Observe
this adjustment through the bottom of the typewriter after
tripping the backspace cam and rotating the power roll by
hand (Figure 56). The stop is also positioned far enough
to the front of the machine so that the backspace pawl
clears the stop by 1/32" when the interlock is operated
and a backspace operation is attempted (Figure 53). Hold
the carriage release levers depressed and operate the back-
space by hand to observe thia clearance.
Backspace Pawl Bracket Assembly
Figure 57. Backspace Mechanism
56