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further to my above post. I suggest checking if there is any vertical pin load. If you DO need to shim below the mast to remove any load on the pin, that you try fixing something like feeler guage strip in the track. I have heard of coins being used but wonder if a fixed strip would make it easier to swing the mast up with no chance of hitting or dislodging the shim. On my boat the mast foot makes contact with the track just before vertical and it has to be pushed home that last few mm indicating that the foot is hard down taking the pressure off the pin.