CROSMAN 2100 You can find CROSMAN Parts and manuals at ( see the link below) This should give you a diagram on how to dissamble a crosman 2100.
see the link below
Look on the right side just below the words Crosman Classic.
Crosman still has parts available for this model. See the links below for the parts manual and Crosman customer service.
See the link below you will find all the Crosman rifles manuals there.
See the link below for the parts manual.
Best to take it to a authorized repair center
Crosman has the information online. See the link below
See the attacked link from Crosman for the parts diagram. See the Link Below.
See the link below for the owners manual.
Crosman still had parts available for this rifle. They also have, on their web page, a link to all their parts and manuals. try http://www.crosman.com/airguns/service/manuals
See the link below for the Owners Manual.