Here's plenty more info:
Converting burner from Propane to Natural Gas - Home Brew Forums
http://www.homebrewtalk.com/.../convert ... ral-gas-...
35 posts - Apr 30, 2009
any ideas on how to do this so I can just work this off my house NG supply?
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Bayou Classic BG14 Banjo Burner with Natural Gas - Home ... - Nov 18, 2009
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And one more:
http://www.google.com/#hl=en&sugexp=les ... 16&bih=588