Q. The jerky motion of the carriage is due to:

A
Hard touch
B
Too much main spring tension
C
High speed
D
Hard cylinder
Solution:

draw cord transmits power by way of the main spring to the carriage. This provides the back and forth motion that makes escapement action of each plunk of the key happen. In other words it transmits the tension needed for the carriage to move each time you tab, backspace and type. Thus if we apply more pressure jerking will happen.

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