i got a n/s shaft removed from a megane going spare here ,
the shaft compared to the standard shaft from my car is about 8-10mm longer
at the GEARBOX end and the actual shaft on the car is much thicker than
the megane one .

- does the thickness in shaft diameter cause any imbalance ?

- is the length of the shaft that critical ? cause from what i remember
n/s shaft gearbox end fitment is a loose one inside g/b