This gun was made by Daisy Air gun. It is a model 880. Daisy still is making a new version of this same model. I suggest you contact Daisy Customer Service at (800) 643-3458 for assistance, or go on-line and search for "Airgun Repair" and find a location near you that can repair the rifle. Daisy may also have a kit to rebuild it.
Numrich Gun Parts Co. http://www.gunpartscorp.com/catalog/Products.aspx?catid=4170
Gun shop, gun shows, want ads.
Try gun shops, gun shows, want ads, Sears memoribilia collectors.
What you have is a Daisy model 1894. You can check the web for Air Gun Repair or see the link below.
You can find parts and/or a manual for an Ithaca Model 72 saddle gun in 22WMRF on many gun websites including GunBroker.com and GunPartsCorp.com. You can also find these items online at DiamondGunSmithing.com.
Try internet auctions, gun shows, want ads, gun shops
You need to do a internet search.
Try e-gunparts.com, gun shows, gun shops, want ads, internet searches.
See the link below for the parts manual.
Try egunparts, gun shows, gun shops
Try gun shows, want ads, gun shops.
You need both.