They keep breaking on me. And I don't have a local hobby store that carries them. So I have to wait few days and pay S&H for $1 part. So I fix the broken ones.
Pix are here:
http://www.mad-russian.org/gallery/main.php?g2_itemId=1281Should be self explanatory.
All you need is some fine glass/carbon fiber cloth and CA glue. Crazy glue from the local drug store will do fine.
Takes just a couple of minutes. And the arms you get are virtually indestructible. Don't look pretty, but do the job.
On the pix one arm is just glued together with the broken piece and the other one was built up from the amputated stub. Both work fine so far on my Lama.
Subject: Broken servo arms? Here's the fix. 
Sat Jun 27, 2009 12:15 am
