Chuck, are you referring to the knurled ring nut at the back of the torque tube pivot ball? That's there to compress a rubberized cork seal sandwiched between the nut and the threaded end of the tube. As the seal compresses, the nut needs to be tightened periodically to prevent leaks, but it needs to be MUCH more than hand tight. Use a big pair of channel lock pliers, and give it a pretty good grunt- - - - -it will stay tight longer, and tightening it up more won't cause any wear or other problems. There shouldn't be any need to use Loctite. It's also possible to use a piece of square O ring material with a diagonal cut at the top of the tube, super-glued together at the joint, which will far outlast the original cork gasket material. You could also tack weld small pieces of 1/4" square key stock to the nut and the pivot ball about 60 degrees apart, drill holes in them, and use twisted aircraft safety wire to keep the nut from backing off.
Jerry
