I guess you've looked at the diagram at https://www.ereplacementparts.com/cr...26_170782.html
. You may have to take out  retaining ring and screws . The brushes  should probably be removed first too. I'm just guessing from looking at the drawing. I'm assuming you can't replace only the spindle lock because the housing is damaged.
Sent from my Hallicrafters S-40 using morse code.