Willierower I really like the idea of pre-threading them on doubled line

I usually just put a bunch in a quart ziploc bag and dig out what I need.
Make up a bunch of different color combos and go from there. The best advise I can give is get the biggers needle to assemble them. I found some really good ones at BiMart in the sewing section called "Yarn Darners" they are really big and stout and will even let you make some rags with McFly Foam. (Oops didn't mean to let that one out) Any other questions I'll see what I can do.