Wire for wrapped connections is specific to wrapping: materials, hardness, flexibility, tolerance to tension, etc. Again, while you can make a decent mechanical connection via wrapping, you cannot make a gas-tight one unless the proper tools, wire, and techniques are used.i fully realize that the unwrapped cant be re-wrapped and it is only feasible if enough slack remains. if a wire isnt long enough why cant solid conductor hookup wire be used in its place?
RE: gun vs. manual...I have a couple of guns, but always use manual tools. One develops a feel. For instance, if a wrap snaps, you won't know it with a gun. Guns are a bit cumbersome, especially in tight places. A good manual tool gives one the tactile feedback to ensure a good connection, and the kind of control required to get flawless connections. I have been challenged by gun toters, for speed and accuracy...manual wins.
Also, for similar reasons, one does not reuse a disconnected punch-down connection (insulation displacement). A fresh section or wire is required. Pioneer did not use this kind of connection but other manufacturers may have.
My input can easily be ignored. I saw what appeared to be an informational deficit. I spoke up. I have restored countless pieces of vintage Pioneer gear of all types. I have never resorted to wire wrapping of any kind. I have repaired problems caused by folks that have. As always, its your gear. You may do with it as you wish.
Enjoy,
Rich P