Hi,
Just looking at my 2B,there is a recess hole at the back of the ‘Y’ axis slide (on top of the knee) in line with the quick feed capstan spindle at the front.
In the recess is a retaining nut which will need a box spanner to remove.The spindle assembly should come out then,remembering that the quick feed pinion is keyed to this spindle.Hope this helps.
Laurence B.