I got curious and started reading the posts here. Big mistake!
Imediately I remembered my first spinning experience in middle school.
My really cool teacher taught me how to spin with a navajo spindle.
I have always wanted to give it a try again.
In any case I started looking round the net at spinning information and I found this fun and funky little wheel. It uses PVC plumbing parts and a wheel chair wheel. http://www.paradisefibers.com/wheels/babe.asp
off the subject - but if one were to spin their own fiber, how much roving would you need for a sweater? (wool for example)