With some trepidation I took the top bolts out tonight ( while using 9D280) idea of ratchet straps - good suggestion thanks).
With some relief all seems fine and dry in there. It seems that the angle between bolt/washer and the gel/glass has started to cut the gel/glass away around the top edge of the washer, so it seems to have progressively cut a neat disc out of the flow/gel/ GRP surface.
So the big bit of steel will be fitted tomorrow as Mr posty left me a nice note saying it was too big to push through the letter box.
However it started me thinking ;
Are these bolts ever put in with a shim inside the transom to avoid crushing ?
Why oh why dont manufactuers install metal frames inside the transom, that extend under floor into stringers to spread the load - these could have shims built in ( surely weight isn't that much of a issue ? - I'm thinking something like small aero engine mounts/ caterham chassis etc)
Why dont they fit a nice bit of steel plate either side of the transom as std anyway ? ( As can be seen on several boats on here ).
So it seems mild panic averted . Many thanks to Biff for his emails inferring its a doddle to fix ( maybe for him - nightmare for me !)
and everyone who as usual listens to my eternally pessimistic posts ...... ( hopefully this allows me, the boats and everyone in them vaguely safe).