According to the customer service rep at SF, the company has redesigned some of their tailcaps to make them more durable when then light is dropped on the tail. I found this out because I dropped my brand new E1L on the concrete shop floor last Friday, one day after it came in the mail. Under 5x magnification, a small dent was visible on the outside diameter of the switch housing. I unscrewed the switch to make sure the inside was OK and ka-sproing, all the tiny switch parts went flying
Customer service was great, as always. Said the new redesigned switch will arrive in 7-10 days. He mentioned that an aluminum ring has been added to reinforce this area. My 2007 E1L had only a white plastic 'tower' that retained all the switch parts, and the tower partially broke on impact.
What a super company to work with