First lets get the name right. Colman never made a model 338, Crosman did. So it's a Crosman model 338. You will need this information to get it fixed.
Crosman offer a service to get older model air guns repaired. Go to the link posted below and open it.
On the Crosman home page, click on "find a service center" at the bottom of the page. Then follow the instructions to locate a repair center.
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