do you have the shutters that came with the enlager?
from what i remember about the e3, there was a shutter because
the bulbs were not "quick start" ( like the big round omegalites that were on the e4 and other later models ), so the bulbs remained "on" all the time and the exposure was controled with a shutter instead.
if you need parts &C for your enlarger, there is a place in canada ( http://www.khbphotografix.com/ ) that either still has them, or may be able to fabricate them for you. when i was looking for a spring-glass carrier for my e4, they were going to make one for me for less than i could have bought one used. from what i understand from people who know this outfit, they have a stellar reputation