At the forward end of the torque tube is a bushing/bearing, and, behind that bushing/bearing is a seal.
There are two ways to fix this, but the easiest way is to use an Okie bushing
that pushes back the original bushing and seal -
here is installation diagram/instructions from Jim Carter.
Wait to hear from others on this.
The other way to fix it requires taking the torque-tube rear end apart (remove gears and drive shaft).
