Check the model number. If it starts with 799. it was made by Daisy. If it starts with 126. it was made by Crosman. If it is a Crosman (126.) model then Crosman offers a locater service (Free) to locate repair shops that repair older Crosman airguns. If it's a Daisy (799) model then I suggest you contact Daisy and ask them..
See the two links below.
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