Turning radius reduced.

mopowers said

Does grinding the nub off cause other clearance issues? There had to have been a reason why they cast that in there, right?

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Well, you have to carefully measure the nubs, then grind some and try turning the wheels back and forth & grind some more. It's trial and error. You can always take more off, but as a wise old friend of mine used to say "I don't know how to cut on".