I am in the process of repairing the cabin top depression on my 1979 Hunter 27. Loosened the shrouds and jacked up the mast. Slid it forward on a piece of plywood and made secure.Removed top of cabin and rot did not appear to be as bad as feared. I will fill in with glass and epoxy and probably add a metal plate for mast step. Also, the main bulkhead is rotted at the top and will have to be replaced. Will also replace the compression post before moving the mast back.This is my first attempt to post a photograph. Hope it works. LamarHendersonville, NC