What size drill should I use to increase hole size in grill orifice to convert it to natural gas from propane?

I have a propane gas grill and want to convert it to burn natural gas. I know the present orifice is too small for natural gas and the hole must be made larger and air adjusted to acommodate for lower natural gas pressure. What size is the hole in a natural gas orifice for an outside grill so I can determine what... show more I have a propane gas grill and want to convert it to burn natural gas. I know the present orifice is too small for natural gas and the hole must be made larger and air adjusted to acommodate for lower natural gas pressure. What size is the hole in a natural gas orifice for an outside grill so I can determine what size drill bit to use?
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