Dump valve extension rod came off

The dump valve extension handle came off of the black tank valve. The valve is inside of an insulated belly pan under the trailer. I was able to screw the extension rod back onto the threaded rod of the dump valve; however, the threaded rod (where I cannot access without removing the belly pan) would spin so I could not torque down the threaded connection.

Is Loctite the only way to secure the extension rod to the dump valve without removing the belly pan?

Mark