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I'm guessing the spring lost one end some time ago, maybe a couple of years ago, requiring 'the knack'.
It has been increasingly notchy, but forceable for a couple of months.
Today, I guess either the spring lost the other end, or the broken bit interfered with the remnant.
We'll find out if the pen spring is strong/durable enough.
mespilus
How long had it been broke for/needing the knack?