if you run into problems finding parts &C in the usual places
harry taylor at http://classic-enlargers.com/
has everything you can think of, including a discussion board.
over the years i have bought things from him and while he isn't "cheap",
he used to work for omega and knows these enlargers backwards and forwards.
and while i haven't had a chance to use them, http://www.khbphotografix.com/ in canada also sells and repair omega enlargers. when i was searching for a working 5x7 negative carrier for my e4 ( mine was missing a few critical parts ) i contacted khb, and if i wasn't able to find what i needed, they were going to machine one for me for less than $50!
( i have a e4 and a military-contract d3v)