Stuffing Tube Installation

[davidshaw57]

I am using a 1/4 ? stuffing tube in a flex shaft application. I want to use a sleeve that penetrates the hull. What size sleeve is required to fit over the stuffing tube snugly.
For water tightness I will solder where they overlap , this will allow me to have the ability to remove the stuffing shaft for replacement and not effect the hull penetration .
Your input would be appreciated.