In case you was wondering the
www.tractorsupply.com/ retail stores in Tilton and Plymouth have like three different sizes of these big farm jacks, good for jacking up a dock or a John Deere tractor, as long as it is brite green & yellow!
Tractor supply is another place to go for dock repair items.
Rands Hardware in Plymouth recently got in about twelve running feet of aluminum, steel, and galvanized steel ..... all large displays with many different angles, tubes, flats, squares in 2-3-4-6' lengths ..... the aluminum is what's used on docks ..... big inventory .... big prices, too ..... but they got the stuff .... down the basement. Is not a thrift store, or a yard sale ... good coffee for 50-cents.
Way to go, RAND'S HDWE!