It could be a proprietary piece unique to the blinds and not routinely carried by a hardware store. I would: 1) call a blind shop and ask if they repair this manufacturer's blinds...and then ask to buy the part, or 2) call the factory and politely, but firmly, ask to speak to a manager (or the manager's manager) until you get the right answer.

Stay away from Smith and Noble. Stay far, far away.

I ordered 6 shades. I paid Smith and Noble to come measure. When the shades arrived, 5 of the 6 were about 1/4 to 1/2 inch too wide for the windows. I asked to return the shades to get my money back. Turns out their "satisfaction guarantee pledge" means that they won't give you your money back, no matter what.

They insist on coming back to re-measure, but a) I can't take time off from work again for this, and b) why would I want to run the risk of further screw ups and hassle?

Their customer service staff come across as Soviet-style bureaucrats. Evidently, Smith and Noble could care less about disappointing their customers and engendering ill will.

I guess my next steps are to file complaints with the BBB and my state's attorney general, as well as dispute the original charge with my credit card company. I'll probably send the shades back to the company's president for good measure.

Keep in mind that Smith and Noble's "partner sites" (i.e. sister companies) include Ballard Designs, Grandin Road, Garnet Hill, TravelSmith, Frontgate, and others. You can rest assured that I won't be giving any of them my business in the future either.