Hi Patrick and Sailor,
Thanks for your responses.
The maramu is a bit different from the SM from what I can work out. There is a small "compression" post under the seat that Then in the engine bay there are 2 posts that are angled to port and starboard onto ribs in the hull. I will check all these again today but they look in good condition.
Interestingly though the post under the seat is angled back a lot fore and aft, so I don't think this could possibly be taking all the load. It has always been like this as long as we have had the boat and I don't see how it could possibly have been installed in column with the mast as the seat construction would make this impossible. I would love to hear from other maramu owners on their setup.
Given this I think that the fibreglass seat must be acting as some sort of "beam" that is transferring the load down to the posts in the engine bay. What I cant work out is how this seat section is fixed in place. I will be spending a bit more time trying to work this out today.
As far as the mast rake I have read the posts on spreader cracking and it appears that there should be a small amount of rake, at least on the SM. Would love to know if this is the same as the maramu.
I will loosening the forestay today and will see what this results in.
Lastly I did not say that this damage occurred at anchor. We have not sailed the boat in the time between when I tuned the rig and noticed the damage.