I just bought two BR 600's, and BOTH gas caps are screwed up, after only a few months. One of them I use myself, so I know it's not employee abuse. I purchased from Ace Hardware, and they gave me 2 caps for free, and I bought two more for back-ups.
We were on our large apartment job when one of the caps fell apart in my hand, rendering the blower useless, and being so far from the shop, we had to complete the job with only two blowers, I was PISSED. Went straight to Ace, and demanded two free caps, and they actually offered my FOUR free caps, but I offered to pay for two. Love Ace.