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Old 03-14-2008
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1) The elongated holes are called halyard slots and usually have a cast fitting put into them to protect the line from chafe and help it lead fair. Most masts aren't sealed, so will let the water out at the base. This is often a cause of wet bilges on keel stepped mast boats.

2) Most aluminum masts have a cast or machined piece at the top that holds the windex, anchor lights and masthead sheaves. This piece also is where the tangs for the shrouds and stays connects. It should be held in place by two or more bolts.
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