The bigger issue is what is moving the sprocket side to side. When the thrower goes up and down, the drive shaft changes length by way of its slip joint. All too often a lack of maintenance (grease) causes the slip joint to bind/lock up and put side pressure on the sprocket. This causes it to eat into the yoke. Pull the slip joint apart, clean it, grease it, and keep it greased (be sure the u-joints are timed correctly when you put it back together). This will prevent the sprocket from chewing through the yoke and your new shims.
Bill
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