I am about to tackle the cabin top depression on my 1979 Hunter 27. My buddy and I plan to loosen the stays and inch the mast forward a few inches. We will build a temporary mast step to hold the mast base in place while making the repairs. We will then remove the area of the cabin top that contains the mast step. Remove the rotten stuff as per several previous postings. Replace with end grain balsa epoxied in place. Replace the cabin top. Then put a stainless steel or aluminum plate and set the mast back in place. Our specific questions are:1. Has anyone done this repair without removing the mast from the boat?2. Does anyone have a photo or drawing of the cabin top with the mast removed? 3. We need to know if there are pins in the mast bottom which correspond with holes in the cabin top. The mast is a Kenyon. Hunter tells me Kenyon is no longer in business. Hunter could not help with the question #2. 4. How do you fastened the stainless steel plate to the boat? Will the epoxy be sufficient to hold the plate in place? Do we need to have some bolts from the plate down into the cabin top? The boat is located on an inland lake and we cannot have the mast removed without hauling the boat as the yard does not have a crane.