On Jan 22, 2:25 am, Grant Erwin wrote:
Picture the little aluminum disk riveted to the top of a Weber kettle. It
closely matches the profile of the domed kettle top.

I want to make something similar in concept, but with different dimensions.
I find I have no idea how to shape e.g. a 4" soft aluminum circle so it
will lie close to the OD of a rounded 3D surface like a tank end.

This is for making a smoker vent ..

Grant

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Spin it using your lathe.

Dan