Thanks for all the advice, guys! However, there are times when it's
smarter to retreat from the field of battle and call in a pro before I
create an even worse problem--like maybe ending up with BOTH master bath
sinks clogged?--by stumbling around with wrenches, snakes and shop vacs
(if only more boat owners would do that!)...and I've decided this is one
of those times. I'm gonna bite the bullet and call a plumber.

At least he won't have to charge extra to fix anything I messed up by
trying to do it myself...hopefully he won't charge extra to let me watch.

--
Peggie
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Peggie Hall
Specializing in marine sanitation since 1987
Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and
Other Sources of Aggravation and Odor"
http://www.seaworthy.com/store/custo...0&cat=6&page=1
http://shop.sailboatowners.com/detai...=400&group=327