Pulling sphere out of a solid piece

Hello I am having at pulling out a half sphere out of solid piece.After trying to pull out half sphere with union solid tool but this happens,little oppenings incavity.how can I solve it,anyone know anything?1526842458461-798086260

Just guessing because your screenshot doesn’t provide enough information. You’re working too small. Use the Dave Method.

Upload the SketchUp file and we can give you more definitive information.

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