My original post has become too confusing. I'll start over.
How do I create a hollow cylinder? I am using Blender 3.0.
Response to Allen Simpson Answer: It works, but ........
Initial sequence => Add > Mesh > Cylinder > F9 > Cap Fill Type menu appears > Cap Fill Type: Nothing => results in a hollow cylinder.
--- Case 1: Wrench icon (right side) > Add Modified > Solidify > Thickness > Changes the cylinder wall thickness.
--- Case 2: Scene Properties (triangle icon) > Units: Imperial - Length: Inches ... N > Dimensions: 0.5, 0.5, 1 ... Wrench icon (right side) > Add Modified > Solidify > Thickness: starts at 0.393701 in => cylinder wall is very thin
Changing thickness makes the wall thicker, but is inaccurate for a 0.5 in diameter cylinder. Setting thickness to 20 inches fills about half of the (outside dimension 0.5 inch diameter) cylinder hole