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See the link below for the parts diagram.
Contact Savage. They are still in business, making good rifles.
You will have to take it apart. Each model is different so you will have to find a diagram of the rifle.
If you know who made it, and they are still in business, probably.
website for gunpartscorp, letter S, Savage, Model 73, and there is a parts diagram.
THIS IS A CROSMAN. It is a Crosman model 140 or 1400
This rifle was made for Sears using the Ted Williams brand name. It was made by Crosman and is really the Crosman model 160. It was made from 1962 -1971. See the link below for the parts diagram.
See the Crosman link below and select your rifle for the diagram and owners manual.
I suggest that you go to the Crosman homepage ( they own Benjamin) and click on "Download a manual" there you will find the owners manual and parts diagram for your rifle. See related link.
webdept@gunpartscorp.com
This requires the services of a gunsmith.
How do you put WHAT. A pellets in the rifle, a BB in the rifle, Put it back together. your question is incomplete.