My friend and I have Silca Impero presta pumps which mount parallel to the seat tube. The presta end of mine is a hollow plastic piece that eventually wore through the paint on the top of the bracket. His however has a Campagnolo presta head that has a curved head with rubber tubing to protect the paint.

He told me that he bought and swapped over his head in the 70s. Does anyone recognise this Campagnolo part and can it still be bought?

Ian