swan neck
http://www.mailspeedmarine.com/searc...k&brand=&leaf=
access plate - rock on, depending on the boat size of course, the size of cut out will change. We just did one on a PS37 with a 2.5" by 4.5" oval cutout with aluminum cover plate same thickness as mast, that is 1" larger in each dimension using (IIRC) 10 #10-24 PHMS to fasten it securely.