Selectric Resources

 

EXPRESS BACKSPACE ADJUSTMENTS

 

1. Express Backspace Shoe Overlap (Level 1) — Form the left arm of the express backspace bellcrank so the express backspace shoe overlaps a maximum of three coils of the carrier return clutch spring.

 

Level 2 — Form the one-piece carrier return shoe arm left or right so that the return shoe overlaps a maximum of the last three coils on the right-hand end of the carrier return clutch spring, and there is equal shoe to pinion spring contact on all three coils.

 

2. Keylever Pawl Guide — Form the keylever pawl guide finger so the tip of the express backspace keylever pawl clears the guide plate by .040”-.080” (1.02-2.03 mm).

 

3. Express Backspace Shoe Clearance — Form the right lug on the express backspace bellcrank so the express backspace shoe engages the carrier return clutch spring when the keylever is .035”-.050” (0.89-1.27 mm) from the bottom of its guide comb slot.

 

4. Keylever Pawl (NRB/S Only) — Form the lug on the express backspace keylever pawl so there is .010”-.020” (0.25-0.51 mm) between the express backspace latch and the backspace interposer latch.

 

5. Express Backspace Latch (NRB/S Only) — Form the express backspace latch front to rear so the backspace interposer moves .001”-.010” (0.03-0.25 mm) to the rear when released by the latch.