thanks for taking the time and trouble to have a look.
There's been some progress...
We've stepped the mast and the bolt head HAS sheared off sometime in the past. We've only been sailing around all summer without one, maybe even since we bought her last year !
There is NO ACCESS to the bottom of these bolts , either by removing the top casing found in the cabin roof over the galley or by removing the keel housing cover !!
Anyway it was simple to remove the broken bolt and replace it. I was not surprised to see that the bolts are made of high speed steel
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. Presumably the main forces are acting downwards on the tabernacle.
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