See here for my personal experience with the gap problem, including pictures, and Hugo's response on how to fix it. I haven't done it yet because it sounds like a rather risky adjustment and I haven't had sufficient time to take my time with it.

FWIW I agree that overall RioCar Mk2a crafstmanship is not up to that of the Mk2. But then again, I had the AC adaptor plug problem (no DC power detection) on my Mk2 and not on my Mk2a.