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leonSugar did a good job in his last revision. Sugar did have some numbers that stuck as you mentioned with N and he had many others too, such as E123 and E125, that Burdick didn't come up with. I do go to Burdick first, then Sugar, then, if nothing....back to "unc" and Burdick....So for me the Haffners are W575-1/D-unc...and so on...I always default to Burdick though...I guess everyone has their own way of doing it....I just find it easier the way I do it ....