- It is a First Class Lever (Effort - Fulcrum - Load). The Effort is applied at the handles.
The spring resist stretching, it keeps the carriage in place when refilling staple bullets.
Stapler again (4,7,8)
- It is a Third Class Lever (Fulcrum - Load - Effort). The Effort is applied at the center of the stapler.
Correction Tape (9,10,11,12)
-The spring resist compression, it is used in correction tape so the when the button at the top of the correction tape is pressed, the cartridge does not go all the way down.