The next step I vary a bit from the original cone.

Cut out an oval of 0.020" styrene plastic and fit it inside the intake. This is a bit "fiddly and you have to fit it in, take it out, sand the edge ges, fit it in...etc, etc.

Use a pencil through the rear hole to push it into place. I like it recessed about 1/8" from the edge. I think it looks better.

Use a bit of solvent cement to "weld" the intake cover in place.

Hold the top of the plate with your finger and push the bottom tight from the inside with the pencil or a wood dowel.

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