Well, I didn't want to corrupt your original Thread ref "wheellocks". But I thought in this case it would be worth posting to get a close-up of the similar, early sear arrangement.
But here are a couple more pics of the Scandinavian lock.
As you may recall, a snaphaunce (Eastern anyway) lock, for a safety, would simply keep the frizzen in the forward position out of striking distance from the hammer.
This lock accomplishes the same, but in a more complicated, yet interesting way. Also note both the main and frizzen springs are one spring. And the shape of the top screw in wheellock style.
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Rick