Problem is that you must remove the end cap and extract exactly one ball, measure it, and then get it back assembled without the balls ending up all over the yard-- of course, I don't have the tool to re-insert the balls... screw it up and you are land bound while you wait for the new balls to arrive or hunting for the last old ones.

I am thinking to order some haarkan ball, hope I guess correctly, and pray for good luck.

Matt