[C MY 4D]

I would look at it closer and make sure the teeth on the quadrant are still in good shape. They tend to strip when they get older.

 

[C MY 4D]

Common problem on these damn things. One of these days I am going to change out my quadrant.

If it was me I would just buy one and keep it in the box until the plastic one breaks. Sometimes having a adjustable setup can be more trouble than it's worth.