Decided that surgery the only option as the force might damage the hull so the intention is to cut out the old and fit new which doesn't have aluminium so remove the potential for corrosion going forward. Booked in to see boat doctor after sailing on Saturday. Thanks to those who have replied 👍 and a tip 9keep your post lubricated to prevent similar happening to you boat 😃 Another lesson learned about what to look for when purchasing 2nd hand. Might be interesting to see how often the new post gets adjusted over the next year 🤔