Based on the answers provided, here are the corrections needed for the 3D object:

1. The smaller cylinder needs to be extruded outwards from the larger cylinder. Currently, it is positioned centrally on top of the larger cylinder, maintaining the same axis. This needs to be adjusted so that the smaller cylinder is extruded outwards from the larger one.

2. The radius of the smaller cylinder needs to be clearly half the radius of the larger cylinder. Currently, it is unclear if this is the case. Please adjust the size of the smaller cylinder to ensure its radius is half of the larger cylinder's radius.