How to check the proper detenting of the element seems to be a widely misunderstood procedure.
To check detenting, simply do the following:
1. Half cycle a letter "J". (With a letter "J" half cycled, it should look like Figure (130).
2. With your finger, remove the rotate detent from the element by pushing the detent actuating lever (38-44) to the left. (The front of the machine is the reference for these adjustments).
3. Remove the headplay in the negative or clockwise direction and allow the rotate detent to reenter the tooth of the element - observe where the detent contacts the element - it should look similiar to Figure 131.