Is your shaft aluminum or steel?
Did your old caps spin in the bore?
That's odd. Usually the caps are a pain to take out and put in. Unless you sand the bores real clean. But still, they shouldn't just slide in that easy. Maybe roughen up the cap a little so it bites better.
It’s an Aluminum shaft and I now find out that this is fairly common with them and it can be taken to a machine shop and rebuilt or buy a new one. Used ones are difficult to find so I have ordered a new one made by Dana so hopefully it will be good for a while
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