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I pulled an infographic off of Futaba a while back that had some suggestions. I can't find it now, but I remember on tip was to remove/open the joint if you can, and use some stickum, or rubberized tape to line the inside part of the joint to add some friction.
Another tip was to put a piece of clear heat shrink tubing over the joint and heating it up, thus causing it to shrink, and hold the joint tightly.
