I found that taking apart the model 31 is very easy, just have to remember the orientation for removing the slide to lift out the bolt. Tricky at first, but I have field striped the gun to get out seed and weed tassles when hunting.
You probably have to disassemble a Model 31 to get a complete appreciation for the brilliance of the design. It's absolutely elegant in its simplicity. Once the big pin is just a bit broken in you can empty the receiver (minus the ejector) in seconds with no tools.
