Hello Listmembers , Iv been working on my Bianchi Specialissima and found a somewhat strange oil drain or filler lug on the bottom of the bottom bracket shell . I have seen tapped holes with a screw in then , but never a brazed on lug with a round extension that sticks out about 1/4 inch . Over the past few days IV looked at 3 Specialissimas and a team Issue bike of the same era , about mid 60's , how unusual is this? Jim, seeking Bianchi esoterica , McCoin Fremont Ca .