Best left to a factory trained gunsmith
At a good gunsmith's shop. Maybe Numrich's Gun Parts (search gunpartscorp) For the complete trigger guard assembly, including trigger, safety, springs, pins etc., you can get it from Numrich, Midway USA, Brownells or direct from Marlin. If it's just the trigger or other individual trigger guard parts you need, you'll have to get those from Numrich for a different model Marlin.
yes it will all you have to do is to take it apart
Rimfire Technologies and DIP are two separate companies. The trigger guard is available at DIP, it's not longer available through Rimfire Technologies. The machine work from DIP is excellent. It's not (never was) an assembly though, it's a stripped aluminum trigger guard. http://www.diproductsinc.com/Default.aspx Go here to buy a new production metal Trigger Guard Assembly https://www.rimfiretechnologies.com/ProductDetails.asp?ProductCode=15001 Old Answer, You should be able to use the stainless steel assembly from the Model 60SS. However, replacing the trigger assembly will probably cost as much as the gun is worth.
e-gunparts.com has on online....
Not much Remington pretends that model never existed, woefull trigger assembly. I would be happy getting anything near or over 100 bucks for a 525 . Based on my own experience. I never had a rifle literaly fall apart on me before , and I take good care of them.
Remove trigger pin with action un-cocked . http://www.histandard.info/manuals/sears/rfrifles/index.html
i think now the only way to find parts is to buy a used gun from someone to fix your own.
The wooden forend on that gun extends back along both sides of the receiver. There is a big honking screw that goes through the wood and the receiver from left to right. Remove that screw and you will be able to remove the trigger group downward and rearward. Please be careful not to lose the disconnector from the right side of the trigger group. Do not dry fire the trigger group. In fact, my advice is not to attempt to disassemble the trigger group unless you are very familiar with that action. It is easy to take apart, but difficult to reassemble. sales@countrygunsmith.net
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.
. to remove the bolt on this model you must lower the tube assembly,there is a screw under the stock, remove stock first.
I'd check with Numrich Gunparts at the link >>>>
Remove the trigger assembly. It should only be 3 screws. The serial number is located on the bottom of that plate. (At least it is on my model 99 m1)