I would pull the shaft and check out the splines, they can start rusting and they wear real fast once that happens and that may cause a little wobble. Also, if you can see the rivits are loose, fix that now, don't wait for a total failure when your out riding, that will ruin your day. Remember, an ounce of prevention is worth a pound of cure... Good luck...
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2004 Honda Rincon (Green) (Sold)
2012 Can Am Outlander 1000xt (Sold)
2015 Can Am 6x6 1000xt