We had Vosper stabilizers on our previous Defever. When it came time to remove the fins to service the seal, the boat yard gave up after a short while fearing they would cause some permanent damage, so I called a boat yard in Seattle who worked on Niad stabilizers. They sent out a young man and he had it out in a short while. All I remember is some wedges and and very large hammer. You may be dealing with a yard that does not have the necessary experience to get the job done.
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