I just replaced the casting that your talking about on my O. There is a roller bearing inside, and mine had apparently run dry over time causing the bearing to disintegrate, and wear away at the casting. I was extremely lucky to find a new cast piece at my local cub dealer...it is NLA, but they had one sitting on the shelf since the 70's. You need to check out the service manual that Matt posted for disassembly instructions, and inspect the inside of it...
Jeff (teet)
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CCC 1211
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1962 Original
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