Paste the cropped region of one image to another image

Hello everyone, I have a full pendulum clock image and another cropped image (only pendulum region). I want to place that pendulum region into 1st image (full clock image). How can I do this. Please guide. Thanks

Please see attached images in order to get clear idea about what I am trying to say.

Answer 1

[Image Analyst]

See my attached copy and paste demo.