IME the Fox-Kautzky is is one of the better vintage single triggers. But if you have problems it might be best to send your Fox to an expert; Dan May comes to mind.
I've seen some mechanical variations inside the trigger plates as the earlier Fox-Kautzky was refined to the production design. If you're thinking of trying to convert it yourself I suggest pulling the trigger plate, study the machining and mechanism and compare with a double trigger Fox trigger plate to see what you're getting into and before removing the Kautzky parts.
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