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Our '77 h27 has rounded ends on the irregularly shaped windows in the main cabin. The shapes were changed at some later time, but were still "custom". Then they went to opening ports. Our fittings are the original white plastic. The project to replace the ports is described a number of times in the archives. It's pretty much the same job on any model of that vintage.The compression post is in plain sight at the starboard side of the door forward from the main cabin. It is actually two pieces of teak at right angles. It runs from the floor liner to the ceiling liner and is actually unlikely to be damaged. In any case, it is easy to inspect.The more likely problem is rotting of the wood core in the deck where it forms the mast step above the compression post. See the archives for several descriptions (including mine) of how this area is constructed, and can be repaired. The symptoms of this rot (when the rig is properly tensioned) are bulges where the ceiling liner droops around the compression post, and the associated arch of teak at the top of the forward bulkhead of the main cabin. As previously stated, another symptom of this issue is tha the sliding door sticks rather than sliding freely.While we are discussing it, rot from water penetration of the wood core of the deck is possible anywhere a fitting penetrates the deck. And if you find it, I would not run away. Just get a quote for a complete repair from a competent yard, and negotiate a corresponding reduction in the purchase price. It can be repaired (see the archives) to better than new condition, and you can do it yourself with the time and inclination.Good luck - this is a great cruising boat for a few people. We love ours, and spend 20+ nights on her every summer.DavidLady Lillie