You can also try here:
RV Awning Repair Parts Online Catalog - PPL Motor Homes
Go through to the parts catalogue, select category "awnings", then select A&E from the manufactures in blue on the left, select patio, then 2000 trans awn, exploded views, exploded view. It looks like they have a replacement bottom bracket made out of plastic for $5.30. That's worth a gamble.
Spare Parts - Dometic says:
" If you are in need of any Dometic
refrigerator,
air conditioner or
A& E awning parts you can also call us at
1-800-544-4881 or purchase from any
Dealer or Camping World location. "