It is not required but stripping it gives you a little bit extra value wich is worth it.
Generally speaking, the copper is the wire. If it is coated, it can be stripped in small sections, but if you need to get rid of a large amount of plastic insulation, you will have to find some safe way to burn it off. Safe, in this context, means in a place where the fumes ( which are toxic ) won't bother anyone, and the metal can be removed without danger- preferably after it has cooled.
The level you need your axe to be before you can cut tree stumps is copper.
A Gun?
To remove a stripped hex screw, you will need a screw extractor tool.
To remove a stripped Phillips screw, you will need a screwdriver with a slightly larger size than the stripped screw head, or a screw extractor tool specifically designed for removing stripped screws.
If the windshield wiper is stripped, first inspect the wiper arm to ensure it’s securely attached to the motor shaft. If it's loose, you may need to tighten it or replace the arm. If the wiper blade itself is stripped, replace it with a new one that fits your vehicle. In either case, ensure that all components are functioning properly before using the wipers again.
If the bolt is stripped, you can try using a different tool or method to remove it, such as using a screw extractor or tapping a larger size bolt into the stripped hole. If these methods don't work, you may need to seek professional help to remove the stripped bolt.
To tighten a stripped Allen wrench bolt, you will need a helicoil or a thread repair kit.
Pre 1982 and some 1982 cent coins are mostly copper. Copper is a commodity traded on a daily basis si the actual price changes daily. An old copper penny has about 3 cents of copper in it, but before you rush down to melt all those copper cents you need to know that congress by law has made it isillegalto do so.
If the spark plug is stripped, replace it, if the hole in the cylinder head is stripped, the first thing to do is run a tap or thread chaser through the hole, if that does not work, you will need a helicoil http://en.wikipedia.org/wiki/Helicoil
Around 50-200 dollars depending on how many windows need stripped Around 50-200 dollars depending on how many windows need stripped
To tighten a stripped Allen head screw, you will need a screwdriver with a Torx or star-shaped tip.