Bow roller wheel - machining

That could be the solution to my issue. My new to me Catalac has a bow fitting for the chain to go through, but has never had a roller - there's no sign of holes for the axle. Would it be sensible to fit one?
Depends on the size of the cheeks. If you fit a roller it will push the chain further forward. If the cheeks do not still provide side restraint it could allow the chain to jump completely out of the bow fitting.
 
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