On my 48" deck, that is where the baffles are attached to the deck. If your deck still has the baffles you will probably find that a previous owner used a longer bolt to be reattach the baffles. I would cut off the bolt to stop the belt from rubbing it.
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Adam
1964 Model 100 w/ K301 12hp and custom hydraulics
1972 Model 149 turned 129 w/ K301 12hp, triple hydraulics, 66 series clone
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