Hi Tim,
I need to remember to thank Tom for the honorable mention!
I have never been able to find an exploded parts diagram or schematic for the 3100, but I have pulled enough break barrels apart in the last 15-20 years to feel very comfortable working without one...the 3100 is a simple little gun.
I have some diagrams which are really close....one is for a Cometa 300 and the other is for a RWS 92....both are cousins to the Crosman 3100.
Let me ask you this, are you trying to get a diagram so that you can tear the gun down?
You said, "...
Need to know about the small spring and guide in the recap area..."
If you are talking about the small coil spring and the matching guide that pushes the safety button back into the "safe" position when the gun is cocked, I know that assembly like the back of my hand and will help all that I can.
I have some pics from a tear down on the 3100 that I did when I was at a buddy's house so show him the "guts" of the gun as he has one too, but the quality of the pics are just so-so.
Again, let me know what you are trying to accomplish and I will help, even if I have to tear my gun down and send you step by step pics...
-Curtis