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?
My response:
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