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There are Sears service/repair centers across the country. Most have the schematics/diagrams you need and carry the parts.
Go to searsparts.com and enter yht model number.
Sears offers a wide variety of replacement parts, including water filter parts, Craftsman parts, Kenmore Parts, and mowers parts. That is just a partial list; there are too many to mention here, in fact! To see if they have a specific part, you should call your local store and talk to the 'Sears Parts and Repair Center". They will be able to find you a specific item.
The first step is to figure out who MADE your firearm- Sears did not make guns- they were made for Sears by several gun companies. The website for gunpartscorp has (at the bottom of home page) a cross reference list that may give you a match- and they have used parts for many guns.
http://www.owwm.com/mfgindex/pubdetail.aspx?id=626
You need the number of your machine (usually on the front edge of machine on a sliver plate) and then you can check at Sears Parts (link below).
It is a Stevens 940B. I have the schematic. sales@countrygunsmith.net
Sears has an extensive library of parts dating way back. Many obsolete models are still listed there, though the parts inventory may be depleted or depleting. If they don't list your model, or if you're not sure how to navigate the site, there is a national parts line that may be able to help. Call 1-800-252-1698. See the related link.
You can get the same diagrams and parts list that are in the original owners manual on the sears, partsdirect web site by typing in the model number. However many of the parts are listed as no longer available.
The parts list on the Sears website on the page titled "Top Cover/Handle" is dated 10/03. That is the only reference I have found so far.
All I can tell you about this gun (Pistol) is it was made by Crosman. The (126) at the beginning of the model indicate Crosman. Unfortunately the Crossover list form Sears to Crosman is long gone and only a few of the numbers are known. Here is what I suggest. Crosman has a list of most all their Air guns / rifles. The list has the Owners Manuals, Parts List and date of Manufacture listed. See the link below for this web site
Sears dot com has quite a few listed for 48 and 54 inch decks. My understanding is there are many baggers that will fit the Sears and am looking into these myself. Need cross reference manufacturers parts list.