First you have to identify who made the air rifle. If the model number starts with 799 then it was made by Daisy. If it starts with 126 then it was made by Crosman. Both companies made airguns for sears under the JC Higgins brand name.
If they were made by Crosman you will have more luck. Crosman offers a service to locate repair shops that repair older Crosman airguns. See the link below.
If it was made by Daisy you may have more of a problem. I suggest you go online and do a search for "airgun repair" and locate a shop near you to repair the Daisy.
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