Starter solenoid removal

[Vintageant]

1972 Fiat 124S. How to remove the starter solenoid from the starter motor housing? Undoing the 3 small bolts, my starter solenoid came out easily enough, but leaving the plunger in place. How is this plunger removed from the starter motor housing? The barb at the tip of the plunger suggests it is somehow locked in place. I have not yet tried brute force. Guidance please!