Here are some pictures showing more progress. The first shows a gap where filler had fallen out under the cockpit floor (the boats upside down in all of these) - I've put some filler in there since I have access. The second shows a pre-emptive strike against leaks at the centreboard and where I've replaced some foam and the piece of wood. The third shows the arrangement for supporting the foam while I fibreglass the inside and the fourth and fifth show it after I've taken the support away. I dug out some foam from the deck mainly as it was wet (picture2) - it might have been better just to dry it out as it didn't show any sign of delaminating. It seems unsurprising that they gain weight as the lay up on the inside is quite porous. Weight is now about 140lbs. I think the mast step repair kit might have been a good idea - but as far as I know they are not available in the UK.