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.
Try eBay, most of the copies are reproductions but they'll have all the info.
Contact Winchester Customer Service through their website.
I tried to put the link in the link section but it wouldn't accept it. Go to http://www.winchesterguns.com/prodinfo/om/index.asp and if you don't find one for the particular model you are looking for, you can order one from Winchester. The Owners Manual to 67a is located here http://afdeals.com/index.php?main_page=product_info&cPath=1_2_5&products_id=15 You Can Find Hard to find Winchester Manuals at http://afdeals.com/index.php?main_page=index&cPath=1_2_5
No known web site.
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Try the auction sites.
You need a manual. Contact Winchester or find a gunsmith and ask for help.
The Sears 2C was made by Winchester and is basically the same as the Winchester Model 131. Owners manuals might be found online at one of the auction site like eBay or GunBroker. We have parts available. sales@countrygunsmith.net
Where can you get the owners manual for a Weed Eater 3.5hp tiller model WER350?
amanonisang@hotmail.com has one.
go to the sears website