hi guys, the utube video is great help to see the problem. for what ever reason the threaded post is to short, but being where it is I would not bandade the repair.
I would drill out the stub and fab another and clean the area around the hole and weld in the new one. use the rudder with the rod end screwed in the new post to get the alinement right then tack weld the post and disassembal the rudder from the frame to make a good weld on both sides.
it not as big a job as it looks like and is well worth the peace of mind even if you had to get a welder to come to you. Make sure you use 4160 aircraft grade welding wire. hope this helps.