Mary-Heather asked a question and my answer got a bit long for the comment section so I will post it here.
Referring to my recent spindle spun 2 ply, Mary Heather asked:
When you ply together two full cops, how do you store the cops?
Are you at a point where your cops end up the same length, so you don't waste any singles?
Ha, ha. If you are looking for advice, have you ever come to the wrong place Mary-Heather! This was the very FIRST time I have ever plyed two cops so I am really not qualified to give advice. I have navajo plyed from a spindle to a wheel, but other than that I have very little experience plying from spindles.
I'll tell you what I did this time though. I slid the cop off onto plastic drinking straws, set them into seperate containers, and plyed to my wheel. Sorry. I have a wheel and I'm not going to struggle plying to a spindle when it's so much easier on the wheel. Spinning the singles on a spindle is different in that I can spin little bits throughout the day while I'm waiting for supper to cook or something. It's those stolen bits of time where I wouldn't/couldn't go downstairs to spin at the wheel that really add up.
As for your second question, about estimating length so that none of the singles are wasted, I actually weighed the spindle with the cop on it, using a food scale, and then spun the second cop to about the same weight. My spinning must be fairly consistent because it worked. I only had about 6 inches difference between the two cops.
For better information about spindle spinning try this source, where I found some good advice about how to handle plying from a cop -- or several. askethebellwether.blogspot.com