Did you know about this site? ereplacementparts.com
I needed some parts for this pos Black and Decker electric weed eater and they seem to have cheaper parts then blackanddecker.com? 🙂 They actually win because of their economical shipping their price of the item was actually more though.
This is the unit I have: BLACK+DECKER LST540 Brushless String Trimmer, 40-volt
I also owned this version: Black & Decker LST136 13-Inch 36-Volt Lithium Ion Cordless High Performance String Trimmer