Greg We have 2 local suppliers that we deal with. GSI = Agri-Bins @ 815-933-4709 Brock = Hendrix @ 815-426-2111 We used the old winch kind to add rings. The hydraulic model the supplier has lifts from the bottom. We did not want to disassemble the bottom ring. We're fairly accustomed to the winch models. The bestway to add rings would be a crane to lift the bin from above while hooked to the inside. But, we're not organized enough to make efficient use of the crane time that would be charged to us. 
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Concrete Blocks Under 27' Grain Bin ?
