

Hi,
sorry, english is not my motherlanguage and I am missing some special words to describe.....
A friend owns a Bridgeport mill. The little nose piece inside of the spindle, which prevent that the clamping tools will move clockwise or anticlockwise during turning the tool fixing screw, is washed out. Please check the picture.
How is it possible to replace?
Down on the spindle is a brass part. 2 holes with inner threads, two without.
What I need to do to replace the nose part?
Thanks in advance
Jockel