Replace spring in a gamo air rifle?
Unlike Crosman, Gamo doesn't offer drawings on how to take there
rifles apart. It would be hard for anyone to tell you how to take
your apart, because you didn't say which model you want to replace
the spring in. So I suggest one of two choices. Go online and do a
search for "airgun repair" and locate someone who repairs airguns
near you and take it to them, or contact Gamo customer service
directly and see if they will send you a parts drawing of your
model. ( See the link below.)