[Healeys] How to remove Master Cylinder Plunger? '60 BT7

[grantlyon at myway.com]

Rebuilding my clutch master cylinder.
Removed MC.
Have disassembled push rod with dished washer after circlip removal.
It is not obvious to me what is holding the plunger assy in the cylinder.
The plunger is free to move down into the cylinder bore, but stops at the
top/end of bore well before the circlip slot.
How to "remove plunger assembly complete" per workshop page E.6 ?