Looking for single, flat 20 tooth cassette cog. I won't pay too much. Sheldon sells them new for $10. But if you have one and want to help a fellow cyclist build a perfect corncob I will at least pay for shipping. (I will take your word for it that it is not worn out).
Please reply to treynolds at saintmailREMOVETHIS dot net, not the above email address (remove REMOVETHIS).