Try e-gunparts.com
A Sears Mod 53 is a Winchester Mod 70. If Sears doesn't have an owner's manual for the 53 (and you can't find one on eBay), go here http://www.stevespages.com/page7b.htm for a Winchester manual.
Photocopies can be found on ebay.
Try the WeedEater website (use Google to find it). I found a down-loadable manual for my line trimmer and my leaf blower.
Contact Winchester Customer Service through their website.
If you don't have a manual, find a gunsmith and ask for help.
Possibly in your appliance parts store, or online.
FIE was an importer of German and Italian firearms, among others.
Follow the instructions in the owner's manual. If you don't have one, find a gunsmith.
Should be the same as Winchester 1400 shotgun. Email me for a copy of the manual.
To install Forge Mod Loader you install it like a normal mod, either manually of with an installer (I recommend MCPatcher) You can find manual installation instructions all over the internet
Contact the company Marlinfirearms.com for a free manual . It can be downloaded
where can i find a schematic for Stevens mod. 311A