Unanticipated problems can be a challenge. The post from the underside of the deck to the bottom is called the compression post
There was a recent thread about the H Cherubini 36 mast step which might help.
You might try to search the archives for something more specific regarding your model.
Are you a DIY type of person with some time? If so, I guess there are two types of fixes for this type of issue. The one that will restore to original --- or the type that will do the trick but not so quite so perfect.
Other forum members probably will weigh in. But if it was my problem and I wanted to save some $'s, and if the compression post failure hasn't already caused a depression on the deck I might look at:
- Loosening the standing rigging -- but still leave firm enough that the mast won't work loose.
- Place a couple of 4x4's cut to the appropriate height fore and aft of the rotted post and car-jack firmly between the keel and the underside of the deck. You might be able to raise the depressed deck an inch or so?
- Replace the rotted post with high quality pressure treated wood (maybe even the really extended in-ground grade). Maybe also soak the bottom end in copper green for added protection.
- Release/remove the car jack temporary compression posts.
The Cherubini Hunter 36 has wood a compression post (in several long pieces) from underside of the deck down to the cabin floor. Then for the remaining 10-12 or so inches from the underside of the floor to the bilge/keel surface, there is a 4" metal post. Don't know if this arrangement is the same on the 27.
Another item about the mast base is at the deck. Issues can occur there as well. Here is the url to thread a way's back for the 27 mast step.
http://forums.hunter.sailboatowners.com/showthread.php?p=707764&highlight=27 step