I picked this Eldico keyer up at a recent hamfest, and did some repair (rectifiers/filter caps/timing circuit) and it's working well now.
The mechanical portion of the thing is interesting. The whole works seems to be mounted in a black resin cast housing which is then machined and fitted with the paddle arm and the adjustment screws for travel and centering. While the spacing of the arms is a bit wide for my tastes, the adjustment screws don't want to budge. I've broken enough things in a similar state to leave well enough alone and use it as is, rather than getting out the TorqueMaster screwdriver.