Thanks Miriam! I'm sure I'm going to be picking your brain lots!! This one doesn't SEEM as simple as the other girls in the herd...
There's one cam in place....I haven't yet figured out how to get it out, and haven't yet found a manual for a 403, altho the page you sent me to says the 503 manual is nearly identical.
---Oh man, I'm going to have competition now. I pick Miriam's brain all the time!