I had a drive shaft that was doing what you describe. As long as you held it centered between the two sockets it was fine but let go and it worked loose on one end. Two cures that worked. The first I tried was to take some foam padding the white type they put on loco trucks to keep them from scraping the frame. This piece was about 1/4" thick. I made two disks each about 1/4" X 1/4" and put it in the drive shaft sockets to hold the shaft centered and it worked well. After I thought about it a while I cut the drive shaft in half and found a ball point pen barrel that was a press fit between the two shaft ends and made the shaft about 3/16" longer. That's the way it has been working for a year or more. You do have to get to it before the little nubs on the end of the drive shaft are sheered off. This is a case where it is better if the shaft falls completely out of it's socket than if it is barely in. j
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