OP lives in NYC. Surely someone in the Big Apple has a chain whip and lockring tool and be willing to help the OP out.

New Yorkers are pretty chill nowadays. Just walk up to a bunch of guys on FG bikes and be like, "Hey, can someone help me out?" The worst that can happen is they say no. If he was in Atlanta I'd do it for him yesterday.

[MENTION=488210]bergerkjh[/MENTION], have a look at Bike Recyclery. They sometimes have nearly new or NOS cogs for cheap.


-Tim-