The use of 5200 is probably the more disturbing part. They went for the easy way out. You may want to complain to the yard management about improper installation and improper materials being used. Maybe they'll cut you a deal, although it won't be anywhere near enough to cover the cost of repair when you need to remove the thru-hull and 5200.
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1978 30' Hughes Northstar 1000
1964 20' Bertram Moppie