You can get the manual from this page with some basic info. http://www.winchesterguns.com/services/index.asp
don't take down a Winchester model 52, the way they bedded the rifle was a mystery. It may never shoot the same if you take it apart.
Best left to a factory trained gunsmith
You should be able to find a assembly-disassembly guide for your Winchester model 37 on E-bay.If not you may to need to visit a qualified gunsmith.
You need a copy of the owner's manual for your rifle- trust me- parts of the bolt are tricky. You can get a copy for free from Winchester is you are in the US. The link below will take you to their order form on their website.
hit it with a hammer
take it to a gunsmith
All Winchester model 12's are take-down designs. Winchester made a model 25 which is solid frame and very similar to the model 12.
Best to ask a gunsmith for help
To find out the value of a Winchester Model 8422, take it to a local gun dealer. They will be able to examine it and determine a value for you.
take it to a gunsmith
Of the 20,580 Model 55 Rifles that were manufactured, appoximately 81% (or 16670) were Take Downs. The Solid Frame Model 55 is the rarest Winchester model configuration ever made. If you can provide me with the serial number and caliber, I can tell you whne it was made, and the overall statistical numbers.