Packing Replacement
CanThe stern tube diameter doesn't really help you, nor does the diameter of the shaft. What you need to know is the dimension of the packing material (i.e., 1/4 inch, 3/16 inch, 1/2 inch, etc.). This is because the flax fits inside the stuffing box, and gets wound around the shaft. The stern tube is aft of that packing gland and is the "hole in the boat" that the shaft goes through to the propellor.I'd call Catalina to find out if you can't find it in your manual on on the C310 website.