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Mine is only about 9 months old.
Not sure why the nose of the diagonal would cause vignetting on really large field stops. To my eye it is the same diameter as the baffle tube. But then I will not get to measure it now until Christmas day! It arrived today and I was allowed to check we had the right part and that is the last I will see of it til next weekend.
Edit, looked at the 41 pan specs and the field stop is bigger than the baffle tube so I suppose that would be a problem in any case. I doubt my budget is Going to go there, but if it did I would be tempted to look at a 31mm Nagler.
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