LOL I have 3 boxes of wire like that. I have collected it over 11 years. I don't mean secrets as in how one may wind, I mean the little things that must be learned on how to change this or that. Like I said I have 3 boxes full of cut off wire from learning those little things and I wont be giving out any hard learned knowledge. Not trying to be secretive just real. All of us had to go this route and learn the hard way. Not at all trying to be mean. I have been here a very long time and there is a ton of information here. If you learn the hard way then you will discover all the little things that make a pickup work. You will then be able to read a post where all the info you are looking for is in there if you know how to read it and see it. I truly am trying to help not hurt. I have had bad information given to me and it sucked. There are those out there who will give wrong info trying to throw you off, none here but there has been and they are all gone now. So in a word, read everything and try it, you'll be better off in the end.
Oh and yes recycle the wire.